nixed two mailing lists

I nixed the pyblosxom-checkins list (we haven't used it in years) and
the pyblosxom-announce list.  In retrospect, I should have said
something on each list before nixing it, but it's too late for that now.

That leaves us with two lists: pyblosxom-users and pyblosxom-devel.  I
think that's good for now.

/will

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