The supplied (default) 'tuxpaint.cfg' is now empty, but is safely appended
to by the NSIS script. NSIS now has a Mode (Windowed|Full-Screen) and a
Resolution (640x480|800x600) option which append the following lines to
'tuxpaint.cfg':
fullscreen=$mode
nofancycursors=$mode
800x600=$res
[Where $mode and $res are "yes"|"no".]
The added file 'options.ini' contains the GUI layout for the new page.
