MySQL 4.1 Required on Trunk

[Max Kanat-Alexander]

	Well, we now require MySQL 4.1 on the trunk. 4.1.8, to be exact.

	Obviously this isn't *too* useful to us right now, since we're
frozen. :-)

	Here's the feature list that we now have access to:

http://dev.mysql.com/doc/refman/4.1/en/nutshell-4-1-features.html

	The most important thing this gets us is subqueries (sub-selects).

	Go ahead and use sub-selects in any Bugzilla code that you want, but
only if they make things clearer, faster, or simpler.

	-Max
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