varint - varint: implement comparison operators

Log Message:
-----------
implement comparison operators

Modified Files:
--------------
varint:
varint.c (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/varint/varint/varint.c.diff?r1=1.1&r2=1.2)
varint.h (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/varint/varint/varint.h.diff?r1=1.1&r2=1.2)
varint.sql.in (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/varint/varint/varint.sql.in.diff?r1=1.1&r2=1.2)