are:
* addition of parameter set validation against a predefined schema;
* Python 3 support;
* NumPy and SciPy are no longer essential, although additional functionality is
available if they are installed;
* added support for YAML-format parameter files;
* added support for opening remote parameter files where you are accessing the
web via a proxy server;
* added export of parameter sets in LaTeX;
* addition of references, i.e. specifying one parameter by reference to another.