Splitted administration and normal web site interfaces.

This optimises a bit the routing map, and make cleaner separation.
Make the base url for admin pages customizable via `administration.base_path` variable in cms.ini
   note: could be /admin, /roc-admin, or ..
It is possible to have a specific theme for administration via the variable "administration.admin"

modules/taxonomy/handler/taxonomy_term_admin_handler.e

@@ -118,7 +118,7 @@ feature -- HTTP Methods
 						else
 							l_page.add_success_message ("Term creation succeed.")
 							s.append ("<div>View term: ")
-							s.append (l_page.link (t.text, "admin/taxonomy/term/" + t.id.out, Void))
+							s.append (l_page.link (t.text, api.administration_path_location ("taxonomy/term/" + t.id.out), Void))
 							s.append ("</div>")
 
 							if