Rename pg_stat_file columns to be more consistent. Split apart change

Bruce Momjian <bruce@momjian.us>

Commit: 070a3ad76b65c9eff572da5d358c563ccc7bb14f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2005-08-15T23:00:14Z
Releases: 8.1.0
Rename pg_stat_file columns to be more consistent.  Split apart change
and creation columns to behave for Unix or Win32.

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