pfSense

fix for #2231

Don't activate master "Save Settings" button on traffic graph min/max.

more verbose log_error on rrdtool restore failure

restore_rrddata() adds log_error calls and uses -f

add rrddata to backup/restore dropdowns.

indentation cleanup

move certain code to new function restore_rrddata()

Fixup halt and reboot to catch the output from the shutdown process properly.

Conflicts:

usr/local/www/halt.php
        usr/local/www/reboot.php

On its own, ntpd does not sync fast enough at bootup, so bring back the ntpdate sync but improve it so it can't get stuck forever.

Fix syntax here too in case we need to revive it.

correct closing tags