varint - varint: implement varint division

Log Message:
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implement varint division

Modified Files:
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varint:
varint.c (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/varint/varint/varint.c.diff?r1=1.2&r2=1.3)
varint.h (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/varint/varint/varint.h.diff?r1=1.2&r2=1.3)
varint.sql.in (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/varint/varint/varint.sql.in.diff?r1=1.2&r2=1.3)