improved Gtk prefs editor
fixed tool bar tool tips
SID filter checkbox is checked when SID card is selected
Prefs::DriveType[] is gone; the 1541 emulation type (disk image, archive file, directory) is now determined automatically. This still needs some work in the user interfaces.
This form allows you to request diffs between any two revisions of this file. For each of the two "sides" of the diff, select a symbolic revision name using the selection box, or choose 'Use Text Field' and enter a numeric revision.