Provide Python bindings

[awvwgk]

We could provide Python bindings directly in this project. Dependent Python projects would be able to just import minpack rather than wrapping the C API themselves.

• Numba compatibility of Python bindings possible with ctypes and cffi but not with Cython:
  https://fortran-lang.discourse.group/t/fortranlang-a-python-package/2870

Related to #14

[awvwgk]

Implemented with #49