#49 datadir didn't properly set when starting the GUI

[bug_reporter]

Hi. I have faced a bug with 1.5.6 version, when after starting the GUI it didn't pickup properly a custom GAME_DATADIR directory, when the binaries itself installed in "/usr/bin" directory - it will set a game_datadir == basedir == /usr/bin

I'm using the attached patch to resolve the issue, which actually writes to the config before read it.

[Ozkan Sezer]

I dropped support for the gtk-launcher for the upcoming 1.5.7 release. Closing this as wont-fix.