* Fixed a float overflow in antialiased lines (this algorithm is a mess, and I need to rewrite it)
 * Wrote a bunch of craderies degueulasses to avoid having y1 already defined in math.h
 * Did I say this antialiased line implementation sucks ?


git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2788 92316355-f0b4-4df1-b90c-862c8a59935f

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* pipi.c: add "--blur" and "--dither" commandline options.
  * blur.c dither.c: remove these examples, pipi.c works a lot better:
     pipi src.png --blur 10 dest.png
     pipi src.png --dither dbs dest.png
    (and of course combinations are possible)

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2694 92316355-f0b4-4df1-b90c-862c8a59935f

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routine. Note that it is not the "real" sharpen which should be built
    on top of a gaussian kernel.

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about twice as fast as the original code in research/2008-displacement.

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