Can safely use getCssHasFeedback now that controller availability is
tested.
Created new hb-choose-collaborator directive.
Added Email section, required for USER's ACTOR Type='Collaborator'.
Js documentation corrected.
Added 1-1 link from USER to ACTOR (Type='Collaborateur') with read only
property on Collaborator fields and possibility to select ACTOR through 
new hb-choose-collaborator directive.
Cleaned up Collaborateur section.
Disactivated password modification section.
Update current USER link to ACTOR upon new ACTOR selection
Update current USER link to ACTOR upon new ACTOR selection.
Fixed $watch for new user creation and regular existing user
initialisation cases.
Added name required validation message.
Removed annoying info message.
Email validation and other required validations added.
Added Email validation and other required fields as example.
Protect $watch in case the main elfin is not yet loaded.
Minor enhancement for validation messages.
Role dependent required validation rules.