Implemented Module enable/disable setting from configuration.

Implemented dependencies checking to set CMS_MODULE.is_enabled.
Implemented the persistence of CMS_USER.roles

src/service/cms_module.e

@@ -23,11 +23,15 @@ feature -- Access
 			-- Description of the module.
 
 	package: STRING
-			--
+			-- Associated package.
+			-- Mostly to group modules by package/category.
 
 	version: STRING
 			-- Version od the module?
 
+	dependencies: detachable LIST [TYPE [CMS_MODULE]]
+			-- Optional dependencies.
+
 feature {CMS_API} -- Module Initialization
 
 	initialize (api: CMS_API)
@@ -42,6 +46,18 @@ feature {CMS_API} -- Module Initialization
 			is_initialized: is_initialized
 		end
 
+	add_dependency (m: TYPE [CMS_MODULE])
+		local
+			deps: like dependencies
+		do
+			deps := dependencies
+			if deps = Void then
+				create {ARRAYED_LIST [TYPE [CMS_MODULE]]} deps.make (1)
+				dependencies := deps
+			end
+			deps.force (m)
+		end
+
 feature -- Status		
 
 	is_initialized: BOOLEAN