add SQL for filtering original files by repository
add repository DAO method for filtering files by repository
add API method for setting files' checksum
genericize Executor.Work

would be nice to do in general with Executor but that's a larger job
implement new repository method
test new repository method
add API documentation note about checking existing hashes
remove executor from managed repository
move worker creators into repository DAO methods
Merge remote-tracking branch 'remotes/origin/develop' into trac-10766-change-hasher
make code slightly clearer
remove accidental imports
Fix createMask.m
add repository method for verifying file checksums
add warning to docs about setting files' checksum algorithm
Bigger Z/T sliders and buttons
Fix createMask byte conversion for non multiple of 8
Add examples of mask creation to the training ROIs function
Define mask size using pixels dimensions
Fix createMask unit tests