Log Message:-----------doc updates, and new arithmetic and hash funcs
Modified Files:-------------- 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)