More infrastructure for btree compaction project. Tree-traversal code

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

Commit: 799bc58dc7ed9899facfc8302040749cb0a9af2f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-02-22T00:45:05Z
Releases: 7.4.1
More infrastructure for btree compaction project.  Tree-traversal code
now knows what to do upon hitting a dead page (in theory anyway, it's
untested...).  Add a post-VACUUM-cleanup entry point for index AMs, to
provide a place for dead-page scavenging to happen.
Also, fix oversight that broke btpo_prev links in temporary indexes.
initdb forced due to additions in pg_am.

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