Synnefo

Update docs

Include bulk COPY/MOVE/DELETE object actions in differences with OOS API

Update pithos docs

Update pithos & astakos api docs

update pithos+ API docs

Integrate Pithos+ and Astakos documentation

Move and rearrange documentation concerning Pithos+ and Astakos.
Most content from the Pithos+ and Astakos repositories have been
integrated inside Synnefo's generic documentation.

Images have not yet been transfered. This is a WIP.