Integrate new IP type from Tom Ivar Helbekkmo.

Author: bmomjian

contrib/README

@@ -31,10 +31,6 @@ int8 -
 	64-bit integer arithmetic for Postgres
 	by Thomas G. Lockhart <Thomas.Lockhart@jpl.nasa.gov>
 
-ip_and_mac -
-	PostgreSQL type extensions for IP and MAC addresses
-	by Tom Ivar Helbekkmo <tih@Hamartun.Priv.NO>
-
 isbn_issn -
 	PostgreSQL type extensions for ISBN (books) and ISSN (serials)
 	by Garrett A. Wollman <wollman@khavrinen.lcs.mit.edu>