switched to Jena TDB store for deposit model

refactored deposit jobs, separating model persistence from tasks
added security checks to deposit update commands and filtered their presentation in JS
added a CDR METS deposit generator for tests
add a separately worked redis queue for memory intensive CDR METS conversion jobs, 1 worker at present
Glad this class is in the repo, just wanted to mention that this bit is hardcoded to your user name and the cdr uri