Changes to 1.0.19

* New menu: Examples.  These are annotated programs that show some
  mathematical concept.  Generally taken from the classes I have been teaching.
  They are installed under prefix/share/genius/examples/ and are mostly using
  graphics so only work in the graphical GNOME/GTK version
* New plotting functions: SurfacePlotDrawLine, SurfacePlotDrawPoints,
  SurfacePlotClear, PlotWindowPresent
* New rotation animation in the surface plot window
* Fix string constants from compiled library starting with 'E' (funky bug)
* A few fixes
* Translation updates (Miguel Rodríguez Núñez, Daniel Mustieles,
  Wolfgang Stöggl, Marek Černocký)

* During making of these changes the author (Jiri) was partially supported by
  NSF grant DMS 1362337 and the Oklahoma State University