TO-DO:
-remove debug information from help messages
  -such as "image==null"
-3D is not smooth. Has discrete plans
  -need oversampling?
-test private static mathematical functions
-javadocs in stereogram generation code (not in gui)
-guide image
-Help content
  -maybe tooltip texts is enough
-find more images (textures and maps)
-start internationalization
  -portuguese
  -create wiki entry for internationalization