remove unused config variable PORTS_PER_ROW
Update to add static NAT translations to the IPv4 address space
See Bug report #971

Update to add static NAT translations to the IPv4 address space
See Bug report #971
Additions to patch supplied by Tim Wilkes

Final Credit for the pull request to me
Merge branch 'BUG_971_v2' of github.com:MWilkinson/racktables into BUG_971_v2

Conflicts:
	wwwroot/inc/upgrade.php