pfSense

- also rename $section arg to $section_name in some functions to clarify

- also robustify parsing for <tagname> and bulletproof the handling of
certain errors

fix cosmetic bug when developer was turned on.

highlight the hidden menu item differently.

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.