[ENH] Faster BMP writing

[Yoshiki Ohshima]

  Stéphane,

  I fixed the conflict.  Attached version loads into 5816 image.

  I found that writing BMP with this patch is 10 to 30 times faster
than writing GIF, especially if you properly cache the data.  (I
haven't measured the PNG, though.)  Certainly the file size is bigger,
but to exchange bitmaps with non-Squeak software, BMP is actually
still viable option.

  Thank you.

-- Yoshiki
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