Use find_package(Python) instead of PythonInterp #151
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Apparently find_package(PythonInterp) is deprecated since 3.12. However, this patch requires cmake >= 3.12, which may be a bit too recent (1 year old next week)...
It is also a bit less convenient to specify a non-default version of python (I have 3.8 and 3.7, but only 3.7 has the various modules installed): I first run cmake (it picks python3.8, the most recent), then edit the python executable with ccmake, and let it configure/generate.
Fix #139.