+ exposing onBeforeChange to Python
+ improve whitespaces
+ fixes #0001361: StartPage scripts and resources are installed twice
+ revert regression with mixing Python debug and release libs
+ fixes #0001363: VRML export can produce corrupt files
+ allow to modify placement via sub-attributes
+ make sure to use valid compression level
+ degree symbol is not 7-bit ASCII, use utf-8
Draft: Fixed polygon center snap