Travis: fix macOS build

do not use bottled libswiften to avoid boost linkage errors

libtransport: set active chat state on conversation message

Not setting it violated XEP-0085 and sometimes tricked other clients
into thinking that Spectrum does not understand chat states.

Closes #282

systemd: wait for network-online.target and add WantedBy=multi-user.target

Thanks to that, "systemctl enable spectrum2" does what expected, that is
makes Spectrum2 start on boot. Also, network.target doesn't tell anything
meaningful - it's just that the network stack is available.
Adding network-online.target makes sure that the network interfaces are up
before starting Spectrum2.

Update docker.md

Docker: fix rm and stop commands

Update docker.md

added --restart unless-stopped option to docker run command line

Carbons (#267)

Forward own messages from legacy network

* requires XEP-280/XEP-297 enabled client and XEP-0356 enabled server
* closes #265

fix directory creation for pid file

make extended_test is now passed under Stretch

packaging: libpqxx-dev | libpqxx3-dev for deb

Xenial have broken libpqxx3-dev package

Define 'foreach' in backends/libcommuni/session.cpp

Fixes compilation issue

[ 64%] Building CXX object backends/libcommuni/CMakeFiles/spectrum2_libcommuni_backend.dir/session.cpp.o
cd /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni && /usr/bin/x86_64-pc-linux-gnu-g++ -DBOOST_FILESYSTEM_VERSION=3 -DDEBUG -DIRC_SHARED -DPURPLE_RUNTIME=0 -DQT_CORE_LIB -DQT_NETWORK_LIB -DQT_NO_KEYWORDS -DSPECTRUM_VERSION=\"2.0.5-git-b15fcedf\" -DSUPPORT_LEGACY_CAPS -DWITH_LIBEVENT -DWITH_LOG4CXX -DWITH_PQXX -DWITH_PROTOBUF -isystem /usr/include/qt4 -isystem /usr/include/qt4/QtCore -I/usr/include/libpurple -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -isystem /usr/include/qt4/QtNetwork -I/usr/include/qt4/Communi/IrcCore -I/usr/include/qt4/Communi/IrcUtil -I/usr/include/qt4/Communi/IrcModel -I/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/include -isystem /usr/share/qt4/mkspecs/default -DBOOST_SIGNALS_NO_DEPRECATION_WARNING -O2 -pipe -O0 -ggdb -o CMakeFiles/spectrum2_libcommuni_backend.dir/session.cpp.o -c /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp: In member function ‘void MyIrcSession::on_socketError(QAbstractSocket::SocketError)’:
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:208:22: error: expected primary-expression before ‘*’ token
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:208:23: error: ‘buffer’ was not declared in this scope
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:208:23: note: suggested alternative:
In file included from /usr/include/boost/asio/detail/reactive_socket_service.hpp:22:0,
from /usr/include/boost/asio/socket_acceptor_service.hpp:29,
from /usr/include/boost/asio/basic_socket_acceptor.hpp:25,
from /usr/include/boost/asio/ip/tcp.hpp:19,
from /usr/include/Swiften/Network/HostAddressPort.h:9,
from /usr/include/Swiften/Elements/S5BProxyRequest.h:22,
from /usr/include/Swiften/Parser/PayloadParsers/S5BProxyRequestParser.h:18,
from /usr/include/Swiften/Swiften.h:112,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.h:30,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:21:
/usr/include/boost/asio/buffer.hpp:1231:24: note: ‘boost::asio::buffer’
inline const_buffers_1 buffer(
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:208:55: error: ‘foreach’ was not declared in this scope
ch (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:208:55: note: suggested alternative:
In file included from /usr/include/boost/foreach.hpp:86:0,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/include/transport/Config.h:24,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/ircnetworkplugin.h:27,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:30:
/usr/include/boost/foreach_fwd.hpp:26:11: note: ‘boost::foreach’
namespace foreach
^~~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp: In member function ‘void MyIrcSession::on_namesMessageReceived(IrcMessage*)’:
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:348:19: error: expected primary-expression before ‘*’ token
foreach (IrcUser *user, userModel->users()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:348:20: error: ‘user’ was not declared in this scope
foreach (IrcUser *user, userModel->users()) {
^~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:348:44: error: ‘foreach’ was not declared in this scope
foreach (IrcUser *user, userModel->users()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:348:44: note: suggested alternative:
In file included from /usr/include/boost/foreach.hpp:86:0,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/include/transport/Config.h:24,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/ircnetworkplugin.h:27,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:30:
/usr/include/boost/foreach_fwd.hpp:26:11: note: ‘boost::foreach’
namespace foreach
^~~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp: In member function ‘void MyIrcSession::sendMessageToFrontend(const string&, const string&, const string&)’:
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:387:23: error: expected primary-expression before ‘*’ token
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:387:24: error: ‘buffer’ was not declared in this scope
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:387:24: note: suggested alternative:
In file included from /usr/include/boost/asio/detail/reactive_socket_service.hpp:22:0,
from /usr/include/boost/asio/socket_acceptor_service.hpp:29,
from /usr/include/boost/asio/basic_socket_acceptor.hpp:25,
from /usr/include/boost/asio/ip/tcp.hpp:19,
from /usr/include/Swiften/Network/HostAddressPort.h:9,
from /usr/include/Swiften/Elements/S5BProxyRequest.h:22,
from /usr/include/Swiften/Parser/PayloadParsers/S5BProxyRequestParser.h:18,
from /usr/include/Swiften/Swiften.h:112,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.h:30,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:21:
/usr/include/boost/asio/buffer.hpp:1231:24: note: ‘boost::asio::buffer’
inline const_buffers_1 buffer(
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:387:56: error: ‘foreach’ was not declared in this scope
ch (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:387:56: note: suggested alternative:
In file included from /usr/include/boost/foreach.hpp:86:0,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/include/transport/Config.h:24,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/ircnetworkplugin.h:27,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:30:
/usr/include/boost/foreach_fwd.hpp:26:11: note: ‘boost::foreach’
namespace foreach
^~~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp: In member function ‘void MyIrcSession::on_numericMessageReceived(IrcMessage*)’:
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:465:23: error: expected primary-expression before ‘*’ token
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:465:24: error: ‘buffer’ was not declared in this scope
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:465:24: note: suggested alternative:
In file included from /usr/include/boost/asio/detail/reactive_socket_service.hpp:22:0,
from /usr/include/boost/asio/socket_acceptor_service.hpp:29,
from /usr/include/boost/asio/basic_socket_acceptor.hpp:25,
from /usr/include/boost/asio/ip/tcp.hpp:19,
from /usr/include/Swiften/Network/HostAddressPort.h:9,
from /usr/include/Swiften/Elements/S5BProxyRequest.h:22,
from /usr/include/Swiften/Parser/PayloadParsers/S5BProxyRequestParser.h:18,
from /usr/include/Swiften/Swiften.h:112,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.h:30,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:21:
/usr/include/boost/asio/buffer.hpp:1231:24: note: ‘boost::asio::buffer’
inline const_buffers_1 buffer(
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:465:56: error: ‘foreach’ was not declared in this scope
ch (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:465:56: note: suggested alternative:
In file included from /usr/include/boost/foreach.hpp:86:0,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/include/transport/Config.h:24,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/ircnetworkplugin.h:27,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:30:
/usr/include/boost/foreach_fwd.hpp:26:11: note: ‘boost::foreach’
namespace foreach
^~~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:490:23: error: expected primary-expression before ‘*’ token
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp: In member function ‘void MyIrcSession::awayTimeout()’:
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:523:21: error: expected primary-expression before ‘*’ token
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:523:22: error: ‘buffer’ was not declared in this scope
foreach (IrcBuffer *buffer, m_bufferModel->buffers()) {
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:523:22: note: suggested alternative:
In file included from /usr/include/boost/asio/detail/reactive_socket_service.hpp:22:0,
from /usr/include/boost/asio/socket_acceptor_service.hpp:29,
from /usr/include/boost/asio/basic_socket_acceptor.hpp:25,
from /usr/include/boost/asio/ip/tcp.hpp:19,
from /usr/include/Swiften/Network/HostAddressPort.h:9,
from /usr/include/Swiften/Elements/S5BProxyRequest.h:22,
from /usr/include/Swiften/Parser/PayloadParsers/S5BProxyRequestParser.h:18,
from /usr/include/Swiften/Swiften.h:112,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.h:30,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:21:
/usr/include/boost/asio/buffer.hpp:1231:24: note: ‘boost::asio::buffer’
inline const_buffers_1 buffer(
^~~~~~
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:523:54: error: ‘foreach’ was not declared in this scope
ch (IrcBuffer *buffer, m_bufferModel->buffers()) {
^
/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:523:54: note: suggested alternative:
In file included from /usr/include/boost/foreach.hpp:86:0,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/include/transport/Config.h:24,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/ircnetworkplugin.h:27,
from /var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999/backends/libcommuni/session.cpp:30:
/usr/include/boost/foreach_fwd.hpp:26:11: note: ‘boost::foreach’
namespace foreach
^~~~~~~
make[2]: *** [backends/libcommuni/CMakeFiles/spectrum2_libcommuni_backend.dir/build.make:126: backends/libcommuni/CMakeFiles/spectrum2_libcommuni_backend.dir/session.cpp.o] Error 1
make[2]: Leaving directory '/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999'
make[1]: *** [CMakeFiles/Makefile2:646: backends/libcommuni/CMakeFiles/spectrum2_libcommuni_backend.dir/all] Error 2
make[1]: Leaving directory '/var/tmp/portage/net-im/spectrum-9999/work/spectrum-9999'
make: *** [Makefile:152: all] Error 2

fix a lot of compiler warnings thrown by newer GCC versions

mostly warnings about:
- comparison differing in signedness
- unused functions and variables
- some casts

Upgrade purple facebook to 0.9.5 (#238)

Would fix #237.