Separate out the VacRUsage stuff as an independent module, in preparation

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

Commit: 12992ab37a05dbcbff5e0629a037f86f5dbb2964
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-10-03T22:52:26Z
Releases: 8.1.0
Separate out the VacRUsage stuff as an independent module, in preparation
for using it for other things besides VACUUM.

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