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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.

Merge documentation of different components and services
all together. Target to a generic, unified, robust
documentation tree.

This is WIP

Add documentation at the admin's quick installation guide. The
section of the pithos+ installation and configuration now contains
info concerning the new pithos+ web client package.

They have to depend on Astakos, move their functionality externally.

- Removed settings that change based on entry_point hooks
- Other minor default values improvements