PtCut 3.3.3 released. Fixes for SageMath and Python 2.x

I have worked around problems that prevented PtCut from being run under Pythin 2.x and hence under SageMath. Furthermore, I have tested and fixed it to run under Linux.

Plus, computation of connected components works again and can be called on a solution file as well.

Download PtCut v3.3.3 here.