When access is denied, also provide when possible and wanted, the needed
permissions so that in the future, user will be able to ask for
permission easily.
Renamed previous user handlers as admin user handlers.
Added non admin user handler /user/{uid} .
Add new `send_...` response to `CMS_API.response_api`, and use them
instead of `create {...RESPONSE}.... ; execute`.
Fixed potential issue with storage mailer initialization if folder does
not exist.
Added utf_8_encoded helpers function on CMS_API interface.
Fixed a few unicode potential issues.
Removed a few obsolete calls.
- added a permission to edit path alias.
- added an admin handler to manage path aliases.
When path alias is changed on node, always keep previous path alias.
(can be unset from the related admin section).
CMS_API.storage.path_aliases returns the list of path aliases (recents aliases come first).
