im.Scale blurs images when they're scaled to their own size

[Spiky Caterpillar]

While this is admittedly bad code,
    $ lab_base = im.Scale(im.Grayscale('uni/lab-1-night-big.jpg'),1024,768)
    image lab base = lab_base
    $ lab_ruddy = im.Scale(im.MatrixColor(lab_base,im.matrix.tint(0.7,0.7,1.8)),1024,768)
    image lab ruddy = lab_ruddy
produces a slight zooming/blurring on transitions from lab_base to lab_ruddy in 6.9.10e, while the picture remains sharp on 6.9.3c.

[Tom Rothamel (renpytom)]

This was done to fix some segfaulting, but obviously produced unusable results. I've identified a strategy to fix this, and will be releasing a 6.10.1.

[Tom Rothamel (renpytom)]

I just committed a fix that will be released in 6.10.1.