Removed obsolete calls, harmonized predefine response, added non admin user pages.

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.

modules/recent_changes/cms_recent_changes_module.e

@@ -141,7 +141,7 @@ feature -- Hook
 
 				create s.make_empty
 				if attached ch.information as l_information then
-					s.append (l_information)
+					s.append_string_general (l_information)
 				end
 				if attached ch.summary as sum then
 					if not s.is_empty then
@@ -248,9 +248,9 @@ feature -- Handler
 				l_size := 25
 			end
 
-			create {GENERIC_VIEW_CMS_RESPONSE} r.make (req, res, api)
-			if r.has_permission ("view recent changes") then
-				l_user := r.user
+			if api.has_permission ("view recent changes") then
+				create {GENERIC_VIEW_CMS_RESPONSE} r.make (req, res, api)
+				l_user := api.user
 				create l_changes.make (l_size, l_until_date, l_filter_source)
 
 				create l_content.make (1024)
@@ -406,11 +406,10 @@ feature -- Handler
 					create htdate.make_from_date_time (l_until_date)
 					r.set_title ("Recent changes before " + htdate.string)
 				end
+				r.execute
 			else
-				create {FORBIDDEN_ERROR_CMS_RESPONSE} r.make (req, res, api)
+				api.response_api.send_permissions_access_denied (Void, <<"view recent changes">>, req, res)
 			end
-
-			r.execute
 		end
 
 feature -- Hooks configuration