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floating point screen coordinates

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The last commit to the TOAD repository is quite a major one and it might break a lot: I've switched the screen coordinates to floating point because

  1. it is not 1995 anymore,
  2. Cairo (X11) and Cocoa (Mac OS X) are also using floating point coordinates and
  3. a graphic tablet can deliver more than just a single integer per axis for a single point.

The changes (there are more) is also destined towards a potential native Mac OS X port of TOAD. In fact, there is already some Objective-C code in the source.