Merge branch 'feature/deprecate-pardiso' into 'master'

Martin Nolterequested to merge
cherry-pick-5d842379 into releases/2.6

Deprecate SeqPardiso and remove test_pardiso.

Closes #17 (closed)

See merge request !152 (merged)

(cherry picked from commit 5d842379)

4c55a5aa Deprecate SeqPardiso and remove test_pardiso.

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