prefix - prefix: prefix_range_cmp() implementation

Log Message:
-----------
prefix_range_cmp() implementation

Modified Files:
--------------
prefix:
prefix.c (r1.19 -> r1.20)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/prefix/prefix/prefix.c.diff?r1=1.19&r2=1.20)
prefix.sql.in (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/prefix/prefix/prefix.sql.in.diff?r1=1.8&r2=1.9)