Update status_dhcpv6_leases.php

(legacy) extend behaviour of "anti lockout" to redirection to avoid lockout by portforward (https://github.com/opnsense/core/issues/327)

Eventually we should try to avoid having lots of rules in the firewall generation.

Switched to standard theme iconography. Padding-left set to 0.

(legacy) fix crashreport "PHP Warning:  array_keys() expects parameter 1 to be array, null given in /usr/local/www/diag_logs_filter_summary.php on line 140"

Slight refactoring in the general area while at it...

This patch fixes a few different issues.
- Prevent the user from selecting all rules at once, the browser probably can't render that amount of data resulting in sloppy behaviour.
- When querying the alerts, show an overlay during the process. This might take some time, depending on the amount of logged items
- Change number of rows selection to more sane defaults.
- Refresh data after "apply selection", to return to the right page