Not activated by default

Removed South and related files

Updated Lock button too 

Added tabs for 'edit' or 'review' mode. 
The Django view checks if the user may view
shared annotations for the anobj. The layout
react accordingly.

The shared annotations list respect the publishing
level defined by the user (owner or public)

Added the possibility to allow or not the members
of an AnObj to publish their annotations for
the other members. Read/write support from
AnObjMgr

AnObj sharing and permission at Backend level
AnObjMgr in FrontEnd allow editing of the sharing
properties. Is able to liste shared AnObj