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/taxonomy/persistence/cms_taxonomy_storage_null.e

@@ -53,6 +53,21 @@ feature -- Access
 		do
 		end
 
+	vocabularies_for_term (a_term: CMS_TERM): detachable CMS_VOCABULARY_COLLECTION
+			-- <Precursor>
+		do
+		end
+
+	is_term_inside_vocabulary (a_term: CMS_TERM; a_vocab: CMS_VOCABULARY): BOOLEAN
+			-- <Precursor>
+		do
+		end
+
+	types_associated_with_vocabulary (a_vocab: CMS_VOCABULARY): detachable LIST [READABLE_STRING_32]
+			-- <Precursor>
+		do
+		end
+
 	terms_count: INTEGER_64
 			-- Number of terms.
 		do
@@ -85,18 +100,25 @@ feature -- Access
 
 feature -- Store
 
-	save_vocabulary (a_voc: CMS_VOCABULARY)
-			-- Insert or update vocabulary `a_voc'.
+	save_vocabulary (a_voc: CMS_VOCABULARY; a_with_terms: BOOLEAN)
+			-- Insert or update vocabulary `a_voc'
+			-- and also save {CMS_VOCABULARY}.terms if `a_with_terms' is True.
 		do
 			error_handler.add_custom_error (-1, "not implemented", "save_vocabulary")
 		end
 
-	save_term (t: CMS_TERM; voc: CMS_VOCABULARY)
+	save_term (t: CMS_TERM; voc: detachable CMS_VOCABULARY)
 			-- <Precursor>
 		do
 			error_handler.add_custom_error (-1, "not implemented", "save_term")
 		end
 
+	remove_term_from_vocabulary (t: CMS_TERM; voc: CMS_VOCABULARY)
+			-- Remove term `t' from vocabulary `voc'.
+		do
+			error_handler.add_custom_error (-1, "not implemented", "remove_term_from_vocabulary")
+		end
+
 	associate_term_with_entity (a_term: CMS_TERM; a_type_name: READABLE_STRING_GENERAL; a_entity: READABLE_STRING_GENERAL)
 		do
 			error_handler.add_custom_error (-1, "not implemented", "associate_term_with_entity")