Migrate the former contrib/txid module into core. This will make it easier

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

Commit: 18e3fcc31e79ab89a3c4296b33946999c0956cbb
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-10-13T23:06:28Z
Releases: 8.3.0
Migrate the former contrib/txid module into core.  This will make it easier
for Slony and Skytools to depend on it.  Per discussion.

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