[Gtkradiant] revert console logging behaviour

[Timothee Besset]

I reverted the console logging code from Spog to it's former behaviour:
- after a failed startup console logging will be turned on, be it a
debug or release build
- prompting to turn off console logging in release build for better
performance. Debug build users will just have to turn off themselves.

Turning off console logging on startup if there's no .pid is a bad idea
because it breaks the ability to ask someone for his startup file and
debug his configuration. Also, for modules debugging, the only log we
can get is through the file since it all happens before the console
widget exists.

TTimo