Purpose
=======
They are a lot of places where we set an attribute 'groups' on a view element and:
- The group doesn't exist anymore
- The group xmlid is not correct
- The group xmlid exists but the modularity is not respected (example: group_stock_user
used in a view in the 'product' module).
Where it happends, nothing warns the user of the developer. The element is just never
rendered.
Specification
=============
Fix the occurences of bad groups definition
Yannick Tivisse
eaba05b9ae