pfSense

Make 0 byte sized log files happy

Actually merge the part that does the real work with FreeBSD groups.

• Introduce interface groups. For now they are availble only on Firewall:Rules section maybe it would be usable to have tham on nat too.
• Some fixes and cleanup.

Replace "Add something meaningful here" with a note about the cached
ip adddress field being green when it is in sync.

Make it more readble by removing unecessary php open/close tags.

Use get_real_interface()

Requested-by: Ermal

Correct colspan, show green cached ip when correct, red when not correct.

Show cached IP address on summary page

• Remove non-needed grep (we use fifolog now)
• Change "No data" to "Gathering data"

Strange how this has survived the interface changes!