Re-allow input of Julian dates prior to 0001-01-01 AD.

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

Commit: 6f664c1af4ebb8d4f131af04d5762ac6f720b70b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-09-23T03:48:14Z
Releases: 9.0.1
Re-allow input of Julian dates prior to 0001-01-01 AD.

This was unintentionally broken in 8.4 while tightening up checking of
ordinary non-Julian date inputs to forbid references to "year zero".
Per bug #5672 from Benjamin Gigot.

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