o Use 'expanded contrast/exposure settings' inquiry data to dynamically
set ranges for those options.
o Incorporate patches for Polaroid SprintScan 35LE (from Dick Bruijn)
- added "Polaroid" vendor string
- screwed around with 'brightness' setting
- attached 'negative scan' button
o sane_exit() now frees the devlist allocated by sane_get_devices()
o upped version to 0.12.2