Add desktop entry file
Automatically install desktop file and png-icon
Document desktop file addition
Merge branch 'add-desktop-file'

Thanks to Richard Benson for the proposal.
Move icons from data/ to data/graphics/
Update application icon

Thanks to Richard Benson for making it.
Merge branch 'update-application-icon'

Update application icon.

Thanks to Richard Benson for making it.
Fix compilation for systems without -n flag
Merge branch 'fix-build-without-n-flag'

Fix compilation for systems without -n flag.