[SciPy-Dev] PROPACK Sparse SVD Integration

[Nicholas McKibben]

Hi all,

Matt Haberland and I are happy to open PR gh-14433
<https://github.com/scipy/scipy/pull/14433> to close the long-standing
issue gh-857 <https://github.com/scipy/scipy/issues/857> through PROPACK
integration into scipy.sparse.linalg.svds based on the previous work done
by @jakevdp in pypropack <https://github.com/jakevdp/pypropack/>.

This PR includes:
- PROPACK wrappers exposing a new 'propack' solver backend for
scipy.sparse.linalg.svds
- an overhaul and expansion of the scipy.sparse.linalg.svds test suite,
documentation, and benchmarks
- inclusion of a new PROPACK submodule under the SciPy organization which
includes patches for known bugs, Fortran compiler support, and OpenMP issues

Thanks,
Nicholas
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