I'd like to propose that an option be added to display years according
to the BCE convention rather than the current BC one.
It looks like within DateFormatter.php,
NormalYear() will need to understand the extra option,
the switch statement within replace() will need to have a case for it,
and a new regex/key/target/rule will need to be added into DateFormatter().
Also, wfMsg("dateformat") will need to be updated appropriately.
Is there anything else I'm missing? Would anyone be willing to help
me with this (I'm really loathe to start creating diffs until I
understand the code better).
-Bill Clark