Improved feed aggregation module.

Added support to choose either atom or rss for the "/feed" format.
  Added support for feed format view to feed aggregation.
  Use proper content type for RSS and ATOM response.
  For feed aggregation  use `?view=feed` or `?view=feed.atom` or `?view=feed.rss`
  Improved sized feed view.
  Use site name for recent changes feed title.
  Better name for node feeds (include the site name).
  Use current date when a feed aggregation is converted to a new feed, to set the last build date.
  Fixed category filter per feed location for the feed aggregation module.
Fixed authentication module, where a potential case (but not probable) had no response content.
Cosmetic and minor changes on messaging module.

modules/node/handler/nodes_handler.e

@@ -80,8 +80,12 @@ feature -- HTTP Methods
 			lnk: FEED_LINK
 			mesg: CMS_CUSTOM_RESPONSE_MESSAGE
 			l_payload: STRING
+			l_feed_name: STRING_32
 		do
-			create l_feed.make (a_content_type.name)
+			create l_feed_name.make_from_string (api.setup.site_name)
+			l_feed_name.append_string ({STRING_32} " : ")
+			l_feed_name.append_string_general (a_content_type.name)
+			create l_feed.make (l_feed_name)
 			l_feed.set_date (create {DATE_TIME}.make_now_utc)
 
 			if attached {WSF_STRING} req.query_parameter ("size") as p_size and then p_size.is_integer then