delete accidentally committed .pyc and .*~ files
committing old changes left to collect dust.
lots of refactoring. now requires python3.x, which breaks gui for now.
delete old file
more refactoring of gui
more refactoring of gui
more refactoringof gui
more refactoring of gui
Update derive.py

move derive format classes back into derive.py
Delete pdf.py
Delete djvu.py
Update processing.py

update imports to reflect class re-location
more gui refactoring
refactor operation bookkeeping and gui progress indicators
refactor gui
gui refactoring. adjustments to process/exception handling
reworking exception handling
Update environment.py

add class description for "Environment"
Update environment.py

add class description for "ScanData"
Update environment.py

add class description for "BookData"