GD linewidth, Agg unaliased

I tried the new Agg backend, very nice. I'm all set

    > to jettison GD altogether and go with Agg except that
    > the anti-aliased graphs that look so great, print
    > poorly.. :frowning: Is there a way to turn off the
    > anti-aliasing? It would be *great* to be able to drop
    > that GD dependency.

agg plus/minus antialiasing is included in the next release, due out
soon. Alpha version is here if you want to test. Please report any