Add functionalities to Python library

[antimu0n]

Hi! Your code is great but some functionalities are missing in the Python library.
For instance, it would be great if you could add the GetSubgroups, SelectSubgroup and AlignAxes functions.
Thanks!

[mcodev31]

Thanks, and sorry for the very slow response.
There are so many things that I hope to get around to implementing with this library, but with a family and full time job it's rare get the time (it also takes a while to wrap my head around everything whenever I do try to spend some time on it). I will add it to the list.