ip4r - ip4r: doc updates, and new arithmetic and hash funcs

Log Message:
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doc updates, and new arithmetic and hash funcs

Modified Files:
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ip4r:
README.ip4r (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/ip4r/ip4r/README.ip4r.diff?r1=1.1&r2=1.2)
ip4r.c (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/ip4r/ip4r/ip4r.c.diff?r1=1.3&r2=1.4)
ip4r.sql.in (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/ip4r/ip4r/ip4r.sql.in.diff?r1=1.2&r2=1.3)