release 3.1.2 - bugfixes

html: Optimized the search for records with the same mac in subnets
html: fixed the display of auto-assignment rules in the general list by rule type
bugfix: Records with other|invalid statuses are excluded from arp processing
bugfix: Fixed the comparison of iptables filters. Now the order of the elements is ignored.
bugfix: removed hardcoded debug from web
bugfix: small fixes in upgrade sub
