Synnefo

Plankton improvements

• Move all plankton metadata to the 'plankton'
  domain.
• Hide plankton metadata from the pithos clients,
  as it was causing problems.
• Use new backend initialization method.

Bugfixes

• Return instead of raise
• Move all plankton_method code inside a try-catch

Change list_shared_images behavior

After discussion with kpap it seems that this
method should return user's images that are shared
to member.

Plankton backend improvements

• Suppress SQLAlchemy warnings
• Make sure list_accounts includes ourself
• Use a file object for put instead of raw data
• Add 'filename' parameter to put

Plankton refactoring