Rename pg_stat_replication.apply_location to replay_location.

Robert Haas <rhaas@postgresql.org>

Commit: 92c30fd2edee6da6e018f41a1d67b4ac2f8fcbdd
Author: Robert Haas <rhaas@postgresql.org>
Date: 2011-02-28T17:49:57Z
Releases: 9.1.0
Rename pg_stat_replication.apply_location to replay_location.

For consistency with pg_last_xlog_replay_location.  Per discussion.

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