Initial queue support in the backend.
Refs #1688Refs #1792
Remove special case for MySQL index.
Refs #1836
Fix tabs.
Change license year.
Fixes #1889
Never delete a path from the public table.
Fixes #1803
Add size queries in backend object lists.
Refs: #1837
Merge branch 'master' of https://code.grnet.gr/git/pithos
Fix metadata search.
create unique index on path for public, xfeautures & path tables
Ref: #1836
Fix SQLAlchemy backend metadata filtering.
Refs #1789
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