Implemented taxonomy administration pages

- create term, vocabulary, add or remove term from vocabularies, ...
Fixed content editing related to taxonomy  (especially with multiple terms vs tags).
Fixed various SQL storage issue related to taxonomy and vocabularies.
Added CMS_RESPONSE.wsf_theme as helper.

modules/admin/handler/cms_admin_cache_handler.e

@@ -44,7 +44,7 @@ feature -- Execution
 			create {GENERIC_VIEW_CMS_RESPONSE} l_response.make (req, res, api)
 			f := clear_cache_web_form (l_response)
 			create s.make_empty
-			f.append_to_html (create {CMS_TO_WSF_THEME}.make (l_response, l_response.theme), s)
+			f.append_to_html (l_response.wsf_theme, s)
 			l_response.set_main_content (s)
 			l_response.execute
 		end
@@ -70,7 +70,7 @@ feature -- Execution
 				end
 			end
 			create s.make_empty
-			f.append_to_html (create {CMS_TO_WSF_THEME}.make (l_response, l_response.theme), s)
+			f.append_to_html (l_response.wsf_theme, s)
 			l_response.set_main_content (s)
 			l_response.execute
 		end