Rename recently-added pg_stat_activity column from txn_start to xact_start,

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

Commit: ef4d38c86c1b1f834bd70115fd19f03431573c2d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-09-11T03:28:05Z
Releases: 8.3.0
Rename recently-added pg_stat_activity column from txn_start to xact_start,
for consistency with other column names such as in pg_stat_database.

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