Sudoku application: fix method visibility
Register a better application ID

We are NOT starting the double-gnome thing again. No no no no no.
Use a better gsettings path

Followup to the previous commit
Hook unfillable squares warning up to gsettings
Use GApplication command line processing
Initialize i18n in the local instance
Move main into gnome-sudoku.vala
Remove extraneous printf
Print puzzle statistics at debug verbosity

This doesn't need to go to stdout every time Sudoku is started.
SudokuPrinter: clean up error dialog

I'm not actually sure how to test this. How do you make printing fail?
SudokuSolver: translate to_string()
Remove LogicalSudokuSolver

This was for the tutorial mode. It might be useful in the future, but
the implementation was highly problematic. It is definitely not on the
agenda anytime soon.
Fix miscellaneous warnings