Cross-account operations in backend/API/docs.
Refs #763
Backend transaction handling.
Backend functions to support cross-account listings.
Fix container purge.
Clean up authorization in the backend. Fix groups.
Use Mapper and Blocker from the hashfiler lib to store hashmaps and hashes.
Update settings.py and database (now a folder).
Backend bugs.
Merge most important changes from the 'trash' branch.
Renew database files.
Fix Content-Length.
Fix is_allowed for groups
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