If PITHOS_QUOTAHOLDER_URL is None, perform internal pithos quota checking
Merge branch 'dev' of https://code.grnet.gr/git/pithos into dev
Conflicts: snf-pithos-app/pithos/api/util.py snf-pithos-backend/pithos/backends/modular.py
Conflicts: snf-pithos-app/pithos/api/dispatch.py snf-pithos-app/pithos/api/management/commands/storagequota.py snf-pithos-app/pithos/api/util.py snf-pithos-backend/pithos/backends/modular.py
By default report size change in object delete/update (do not include older version size)
Fix undefined variable
Fix sqlalchemy warning: IN-predicate invoked with an empty sequence.
Send versions as string in resource events queue
Include version information in aquarium messages
Comment out sqlalchemy echo
Change QuotaholderSync to QuotaholderSerial
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