Merged lp:~widelands-dev/widelands/bug-net-error-game-connect:
Fixes on the communication between widelands and the metaserver:
- Permit answering PING requests even while logging in
- Printing current time to console when logging in.
Eases finding the corresponding log entry on the metaserver when debugging
- Re-enabling and fixing unused code for whisper message to nonexisting player
- Handling error message when trying to join a non-existing game
- Avoid hanging client even after being notified about the non-existing game
- Removed no longer needed error messages