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/feed_aggregator/feed_aggregator_module.e

@@ -98,8 +98,7 @@ feature -- Handle
 							m.header.put_content_type_text_html
 							res.send (m)
 						else
-							create {NOT_FOUND_ERROR_CMS_RESPONSE} r.make (req, res, a_api)
-							r.execute
+							a_api.response_api.send_not_found (Void, req, res)
 						end
 					else
 						create {GENERIC_VIEW_CMS_RESPONSE} r.make (req, res, a_api)
@@ -143,8 +142,7 @@ feature -- Handle
 						r.execute
 					end
 				else
-					create {NOT_FOUND_ERROR_CMS_RESPONSE} r.make (req, res, a_api)
-					r.execute
+					a_api.response_api.send_not_found (Void, req, res)
 				end
 			else
 				create {GENERIC_VIEW_CMS_RESPONSE} r.make (req, res, a_api)
@@ -199,7 +197,6 @@ feature -- Hook
 			-- List of block names, managed by current object.
 		local
 			res: ARRAYED_LIST [like {CMS_BLOCK}.name]
-			utf_conv: UTF_CONVERTER
 		do
 			if
 				attached feed_aggregator_api as l_feed_api and then
@@ -209,7 +206,7 @@ feature -- Hook
 				across
 					l_aggs as ic
 				loop
-					res.force ("?feed." + utf_conv.utf_32_string_to_utf_8_string_8 (ic.item))
+					res.force ("?feed." + utf_8_encoded (ic.item))
 				end
 			else
 				create res.make (0)