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/cms_term_collection.e

@@ -19,6 +19,7 @@ feature {NONE} -- Initialization
 	make (nb: INTEGER)
 		do
 			create items.make (nb)
+			items.compare_objects
 		end
 
 feature -- Access
@@ -48,6 +49,21 @@ feature -- Status report
 			Result := items.has (a_term)
 		end
 
+	term_by_id (tid: INTEGER_64): detachable CMS_TERM
+			-- Term of id `tid' contained in Current, if any.
+		do
+			across
+				items as ic
+			until
+				Result /= Void
+			loop
+				Result := ic.item
+				if Result.id /= tid then
+					Result := Void
+				end
+			end
+		end
+
 feature -- Element change
 
 	wipe_out