Tweak fillfactor code as per my recent proposal. Fix nbtsort.c so that

Tom Lane <tgl@sss.pgh.pa.us>

Commit: d29b66882a5de0878c496bd71d0c69af17197ab7
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-07-11T21:05:57Z
Releases: 8.2.0
Tweak fillfactor code as per my recent proposal.  Fix nbtsort.c so that
it can handle small fillfactors for ordinary-sized index entries without
failing on large ones; fix nbtinsert.c to distinguish leaf and nonleaf
pages; change the minimum fillfactor to 10% for all index types.

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