Improve logging of checkpoints. Patch by Greg Smith, worked over

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

Commit: 9fc25c0511b2d45f2a4eb16e8a03911eac89fb61
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-06-30T19:12:02Z
Releases: 8.3.0
Improve logging of checkpoints.  Patch by Greg Smith, worked over
by Heikki and a little bit by me.

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