Improved taxonomy by supporting tags, multiple terms allowed, and required kind of vocabulary for specific content type.

Updated node web form, to support taxonomy editing if allowed (specific support for CMS_VOCABULARY.is_tags: BOOLEAN).
Added notion of required or optional module dependencies.

src/configuration/cms_setup.e

@@ -132,14 +132,16 @@ feature {NONE} -- Implementation: update
 				until
 					not a_module.is_enabled
 				loop
-					if
-						attached a_collection.item (ic.item) as mod and then
-						mod.is_enabled
-					then
-						update_module_status_within (mod, a_collection)
-					else
-							--| dependency not found or disabled
-						a_module.disable
+					if ic.item.is_required then
+						if
+							attached a_collection.item (ic.item.module_type) as mod and then
+							mod.is_enabled
+						then
+							update_module_status_within (mod, a_collection)
+						else
+								--| dependency not found or disabled
+							a_module.disable
+						end
 					end
 				end
 			end