Check if user is disabled

Pass datetime as text to DBSelect
Selected topups ValidFrom must equal the first of the current month

* Modified NAS-Port-Id to use a blank default if not defined (in the case of vpn's)

Added UPGRADING file for upgrading information from previous revision

Added default config get
Added client config get

Added mod_config_sql_topups queries to config

* Make userdb macros entirely dynamic

* Use  request.  and not  authentication. as macros

* Fixed incorrect configuration, we need to load the config module for system, not the userdb module

Added initial support for realms and realm attributes

* Added template queries to the smradiusd.conf file

* Added authentication mechanisms & users config section