[IMP] partner_profiles_portal: new portal structures data management

refactors the way a portal user can edit the data of the structures he
is affiliated with.
All main, public and position profiles data are gathered in one
"structure" form.
Adds several navigation improvement (back to structures list,
validation message, ...)

partner_profiles_portal/controllers/__init__.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
 
-from . import portal_my_profiles
-from . import portal_partner_profile
+from . import portal_my_structures
+from . import portal_structure_profile
 from . import portal_my_account