Improve documentation
Switch from boost::asio to QNetwork.

This adds the UnixDomainConnector class as replacement for the
'connector' class. The implementation is quick & dirty and needs a lot
of code & doc cleanup.
Exclude moc-generated files from doxygen input.
Improve UnixDomainConnector, add docs.
Remove classes connector and timeout_timer.

The functionality was replaced by UnixDomainConnector.
UnixDomainConnector: Check #includes.
Fix typos