Added CMS_CORE_MODULE which is the mandatory module for ROC CMS.

Added CMS_USER.profile_name .
Improved module managements with install vs enable.
  - enabled/disabled status can also be stored in database.
Install procedure do not install all available modules anymore.

examples/demo/roc.cfg

@@ -4,6 +4,7 @@
 	"location": ".",
 	"site_directory": "site",
 	"modules": {
+		"core": 			{ "location": "../../modules/core" },
 		"admin": 			{ "location": "../../modules/admin" },
 		"auth": 			{ "location": "../../modules/auth" },
 		"basic_auth": 		{ "location": "../../modules/basic_auth" },