backend/canon_pp-dev.h: Many changes: Bug fixes, less memory leaks (none left now?), more relaible, faster. Biggest changes are speculative reads (ask scanner to read more while data processing
occurs) and more reliable sending of commands. Slight performance
increase over previous version.
* doc/sane-canon_pp.man: Added discussion noting that scanning
greyscale in green is bad for colour.
models. Also corrected typo which caused full bed scans to fail. Disabled
problematic detect for now, will make detection slightly slower. Patch from
Matthew Duggan <stauff1@users.sourceforge.net>.
Henning Meier-Geinitz <henning@meier-geinitz.de>