This patch adds the ACCOUNT target

The ACCOUNT target is a high performance accounting system for local networks.
It takes two parameters: --addr network/netmask and --tname NAME.

--addr is the subnet we want accounting for
--tname is the table name where the information is stored

The data can later be queried using the libipt_ACCOUNT userspace library
or by the "iptaccount" tool which is part of the libipt_ACCOUNT package.

For more information go to http://www.intra2net.com/opensource/ipt_ACCOUNT