New design for self documented router.

The documentation is built only on demand.
A mapping entry can be hidden for the documentation
One can change the status code when building itself the WSF_ROUTER_SELF_DOCUMENTATION_MESSAGE

library/server/wsf/router/wsf_router_mapping.e

@@ -10,6 +10,7 @@ deferred class
 feature {NONE} -- Initialization
 
 	make (a_resource: READABLE_STRING_8; h: like handler)
+			-- Create mapping based on resource `a_resource' and handler `h'
 		deferred
 		end
 
@@ -25,6 +26,13 @@ feature -- Access
 		deferred
 		end
 
+feature -- Documentation
+
+	description: READABLE_STRING_32
+			-- Short description of associated mapping.
+		deferred
+		end
+
 feature -- Status
 
 	routed_handler (req: WSF_REQUEST; res: WSF_RESPONSE; a_router: WSF_ROUTER): detachable WSF_HANDLER