python interface for sprs

[chetmurthy]

Hi, a while back I mentioned that I had written some Python code to wrapper sprs. I got permission to open-source that code (Apache license), and thought I should mention it here. I don't know exactly which bits might be useful to sprs, but .... well, figured we could start the conversation.

Link to the file containing the python bits: https://github.com/chetmurthy/qrusty/blob/master/pyqrusty/src/lib.rs

I'm happy to do more work on this, with suggestions as to how it should evolve. Ditto move bits of this into sprs.