block_ip.sh and iptables 2.1

Updated iptables and scripts for this feature
http://help.directadmin.com/item.php?id=380

See file differences from 2.0 here

Changes

Updating

Run steps 1, 2 and 4 from this guide, with version 2.1 set:
http://help.directadmin.com/item.php?id=380&in1=2.1.