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Port to cython

Hello Richard,

This was triggered by the recent finding that scipy sparse classes introduce such an overhead that sparse matrix checks take more time in GridCal's power flows than the matrix multiplication and linear system solving combined. That is absurd.

So I started reading Davis's book and when googled "CSparse python", your repository appear (who else!)

Well, right now I am porting your code to python 3, with the final aim of taking critical parts into cython and maybe link MKL for the linear system solving. I think this code is perfect for that because it is written in system python with no numpy dependencies.

I am interested about your thoughts on this, and if you know any other competitive sparse lineal algebra library in python, preferably python wrapper of a C/Fortran library.

Best regards,
Santiago

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