IP Traffic: when/if set to 'disabled', we 'really' mean it
* when set to 'disabled' on page admin-iptraffic.asp, not a single iptables rule should be generated/created/loaded on rc/firewall.c (re: ipt-account rules)
* also, there should be consistency throughout the web UI - therefore, any/all pages under the 'IP Traffic' menu on the web UI should behave accordingly:
* a: show a warning about this particular feature being currently disabled and...
* b: show the user a link to IP Traffic 'main' settings page (similar to what happens on most of the pages inside the 'Bandwidth' group/submenu)