Refs: #2675
Introduce alembic
eliminate nested sql aggregations
Call for delete container contents
Refs: #2611
Fix size & type of copied objects (sqlite)
Fix size & type of copied files
change backend to raise custom exceptions
Progress II: update sqlalchemy pithos backend lib
optimize sorts
Fix change object content type (move object)
Do not include children of public objects in listings
Refs: #2394
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