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

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

Commit: fcb2326180ebad04106f745f646c4e02bc9ff10f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-09-23T03:48:20Z
Releases: 8.4.5
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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