Wishlist: PHCpy for Python 3 without QD

[d-torrance]

From what I understand, there are two versions of the Python 2 PHCpy that just used doubles instead of the higher precision floating point types from the QD library:

https://github.com/janverschelde/PHCpack/blob/3ea105c2b6ec8d28a748ba1b67a4cf9a29cd4c2e/src/Mod/READ_ME#L28-L29

It would be great if these could be ported to Python 3, since the QD library has a non-free license and Python 2 has reached its end of life.

(I was able to hack together a double-only Python 3 version for the Debian package by linking against lib2path_d and deleting a bunch of dd_real and qd_real stuff from various source files, but I'm sure there's probably a better way!)

[janverschelde]

Thanks for the hack. The QD library should indeed become optional. Recently code generated by the CAMPARY software was applied for multiple double arithmetic.