(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

(ui) add refresh method to jquery.bootgrid.js, temporary added this into the compiled js file should extension should probably move to somewhere else.

(legacy)  add support to system_usermanager.php for edit/add new using GET in addition to POST, needed for other modules to link to this page in a more natural way.

Page need proper cleaning.

(legacy) fix dependencies, related to crashreport "PHP Fatal error:  Call to undefined function services_dnsmasq_configure() in /usr/local/etc/inc/interfaces.inc on line 3098"

(legacy) fix crash report "PHP Warning:  explode() expects parameter 2 to be string, array given in /usr/local/www/interfaces_bridge_edit.php on line 290"