* Updating SuperLU package file with ability to build version 4.3 (before they added cmake) with external blas or internal blas, and added capability to build the latest version 5.2.1 (with cmake) with internal blas.
* Updating SuperLU package file with suggested changes, i.e. reorganizing installation methods based on version, adding cmake dependency when necessary, removing any use of internal blas, and also adding fpic variant.
* Fixing flake8 failures.
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