updated copyright dates
SID filter checkbox is checked when SID card is selected
Frodo doesn't quit any more when glade file is not found
about window can be opened more than one time
no more drive type widgets
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.
first attempt at Glade-based prefs editor for Unix
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