This commit implements customizable threshold-based alerts which
are handled per-interface. Alerts are accessible via the alerts
tab of the interface menu of the web GUI.
This addresses issue #21.
This commit adds to the per-interface Packet Dump tab an option
to dump all traffic to the selected media. This makes the dump
filtering option a three-state mechanism, which allows to
disable dump, enable dump only for selected hosts, and enable
dump of all traffic.
This commit makes the maximum size of pcap dumps configurable
by adding a per-interface parameter modifiable via the web
interface. This commit also adds a comment in the web interface
about the periodic check and automatic deletion of old pcap files
after reaching the threshold.
