Removed any (put|write)_file_content from the WSF_ or WGI_ OUTPUT classes

Now DEFAULT_SERVICE has to be created instead of inherited.
   - This seems to be better for new user, and this avoid potential conflict and difference when inheriting between the various DEFAULT_SERVICE implementation.
   - remember that DEFAULT_SERVICE, is mainly to help the user to build its very first service.
Use READABLE_STRING_8 as argument whenever it is possible.
Added WSF_RESPONSE_MESSAGE, and WSF_RESPONSE.put_response (a_response_message)
Now WSF_RESPONSE inherit from WGI_RESPONSE

library/server/wsf/src/response/wsf_page_response.e

@@ -0,0 +1,45 @@
+note
+	description: "Summary description for {WSF_PAGE_RESPONSE}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	WSF_PAGE_RESPONSE
+
+inherit
+	WSF_RESPONSE_MESSAGE
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	make
+		do
+			status_code := {HTTP_STATUS_CODE}.ok
+			create header.make
+		end
+
+feature -- Status
+
+	status_code: INTEGER
+
+feature -- Header
+
+	header: HTTP_HEADER
+
+	body: detachable STRING_8
+
+feature -- Output
+
+	send_to (res: WSF_RESPONSE)
+		do
+			res.set_status_code (status_code)
+			res.write_header_text (header.string)
+			if attached body as b then
+				res.write_string (b)
+			end
+		end
+
+end