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/node/handler/node_handler.e

@@ -75,6 +75,14 @@ feature -- Query
 			end
 		end
 
+feature -- Permissions
+
+	view_unpublished_permissions (a_node: CMS_NODE): ITERABLE [READABLE_STRING_8]
+			-- Permissions to view unpublished node `a_node`.
+		do
+			Result := <<"view unpublished " + a_node.content_type>>
+		end
+
 feature -- HTTP Methods
 
 	do_get (req: WSF_REQUEST; res: WSF_RESPONSE)
@@ -148,7 +156,7 @@ feature -- HTTP Methods
 							attached api.user as l_user and then
 							(	node_api.is_author_of_node (l_user, l_node)
 								or else (
-									api.user_has_permission (l_user, "view unpublished " + l_node.content_type)
+									api.user_has_permissions (l_user, view_unpublished_permissions (l_node))
 								)
 							)
 						then
@@ -403,15 +411,10 @@ feature -- Error
 
 	send_access_denied_to_unpublished_node (req: WSF_REQUEST; res: WSF_RESPONSE; a_node: CMS_NODE)
 			-- Forbidden response.
-		local
-			r: CMS_RESPONSE
 		do
-			create {FORBIDDEN_ERROR_CMS_RESPONSE} r.make (req, res, api)
-			r.set_main_content ("This content is NOT published!")
-			r.execute
+			send_custom_access_denied ("This content is NOT published!", view_unpublished_permissions (a_node), req, res)
 		end
 
-
 feature {NONE} -- Node
 
 	create_new_node (req: WSF_REQUEST; res: WSF_RESPONSE)