Log Message:
Changes 20110222:
* Did a lot of work to improve the accuracy in remove overlap. Improved
  accuracy means that it is less likely to do the wrong thing. Problems happen
  when there are points or intersections very close to each other.
  (So quadratic glyphs are more likely to have problems than cubics simply
  because they have more points, on average).
* Fix various error messages.
* Remove some obsolete documentation.
* Technical fixes to stroking code.
* Add a miterlimit to stroking code.
* FontForge was using the wrong MIME type for svg files. W3C has changed it and
  it's now "image/svg+xml" not "image/svg-xml" or \ 
"image/svg".
* Since Inkscape images tend to be at unexpected y positions, force the view to
  rescale/recenter itself if the result after a paste/import is outside the
  current window. (Inkscape tends to put things at the top of a page, but the
  origin is at the bottom, and FF looks at the origin.
* A line joint of 180 degrees (which shouldn't have happened in stroking, but
  did) caused an infinite loop.
* Typo in add extrema code (again).
* More...