pfSense

Fix PHP Warning about invalid argument supplied for foreach

If _POST['members'] or _POST['groups'] is not set / none selected at GUI, it would give a warning on crash reporter (dev versions)

Merge pull request #2999 from phil-davis/patch-6

Validate submitted groups when editing a user. Ticket #6475

Add input validation to system_groupmanager.php to prevent invalid members from being submitted. Ticket #6475

Merge pull request #2998 from phil-davis/patch-5

Fix #6460 Interface mismatch apply changes button

Rework pkg_mgr_install.php:

- Stop using id parameter for additional packages, keep using it only
for firmware upgrades
- Created to control variables $completed and $confirmed to check all
the stages and make it easy to understand what is happening
- Stop using $pkgid and use $pkgname instead...

Fix variable name s/POST/_POST/ and also parameter name s/complete/completed/

Fix indent

Improve readability