TranscribeFile: Assign checksum to transcriptions
Update Tesseract OCR command
TranscribeFile: insert transcription event to DB
TranscribeFile: move insert into new function
Assign file UUIDs: provide option to disable filegrpuse override

This is necessary to deal with certain places where meaningful
filegrpuses have already been assigned, and overriding the values
makes it impossible to correctly track these files in the METS.
Assign file UUIDs to metadata: Don't update fileGrpUse

Updating the fileGrpUse here was clobbering meaningful fileGrpUses set
in previous microservices: for example "text/ocr", set by Transcribe.
CreateMETS2: don't treat all text/ocr as Dspace
TranscribeFile: scan derivatives if original is not transcribable
TranscribeFile: treat transcriptions as derivatives
Normalize: add derivative ID information to the database
Normalize: don't add thumbnails to the database