Added support for user, user_roles, page, blog export and import.

Added basic support for comments, for now mainly viewing comments from database (no submission forms yet).
Added first simple wikitext filter (render wikitext content as xhtml).
Ensure response content type is text/html with utf-8 charset.

modules/node/export/cms_export_node_utilities.e

@@ -19,7 +19,7 @@ feature -- Access
 		local
 			jo: JSON_OBJECT
 			ja: JSON_ARRAY
-			j, jterm: JSON_OBJECT
+			jterm: JSON_OBJECT
 		do
 			create Result.make_empty
 			Result.put_string (n.content_type, "type")