fix list_objects
Refs: #2394
Merge branch 'master' of https://code.grnet.gr/git/pithos
change API calls to include public objects in shared by me
Delegate feedback post request to Identity Provider (stakes)
Refs: #2418
Do not use sample users by default
pass umask parameter in ModularBackend
fix login force
Calculate the length of the last block properly.
Fixes #2321
Solve OOS API compatibility problems.
Fixes #2300
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