prefix - prefix: First picksplit() implementation of AndrewSN ideas,

Log Message:
-----------
First picksplit() implementation of AndrewSN ideas, missing the preliminary sorting pass

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