Parse CE and BCE in dates and times

Folks,

Please find attached a patch to do $Subject. As dates in a fair number
of fields of endeavor are expressed this way, it seems reasonable to
ensure tha we can parse them on input. Making it possible to use them
in output is a more invasive patch, and would involve changes to
to_date and similar that would require careful consideration.

Best,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778

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