Further review of xact.c state machine for nested transactions. Fix

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

Commit: b6197fe06939d35f67abee1ebe62690d43199783
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-07-01T20:11:03Z
Releases: 8.0.0
Further review of xact.c state machine for nested transactions.  Fix
problems with starting subtransactions inside already-failed transactions.
Clean up some comments.

Files