Added authentication module webapi, to provide registration via webapi.
Improved the roles display by providing table of permissions if asked.
Added various links in primary tabs to navigate back to roles or users, depending on the page.
Added datetime to-from string converters in CMS_ENCODERS.
Start removing CMS_ADMINISTRABLE.
Added permission to use simple core access token.
Added webapi for users: list, new, register.
This optimises a bit the routing map, and make cleaner separation.
Make the base url for admin pages customizable via `administration.base_path` variable in cms.ini
note: could be /admin, /roc-admin, or ..
It is possible to have a specific theme for administration via the variable "administration.admin"
Added CMS_MODULE.permissions to allow module to declare the potential permissions.
Added support for CMS_LINK.is_forbidden, in relation with CMS_LOCAL_LINK.permission_arguments.
Split link "username (Logout)" into 2 links "username" and "logout".
Fixed/Changed the way auth modules alter the logout link based on "(Logout)" title, by safer solution based on `location' of the link.
Fixed usage of WSF_REQUEST.path_info by using percent_encoded_path_info which is not non unicode path info to be used most of the time.
Merged CMS_REPONSE.variables and CMS_REPONSE.values .
When possible, prefer usage of CMS_RESPONSE.user instead of CMS_REQUEST_UTIL.current_user (WSF_REQUEST) whenever it is possible.
When possible, prefer usage of CMS_RESPONSE.location, rather than usage of WSF_REQUEST.(percent_encoded_)path_info .
Code cleaning.
