Local merge of Tin Kei's clean up of test_divB (!16) · Merge requests · struphy-hub / struphy · GitLab

Stefan Possanner requested to merge local_test-div-B-clean into devel Jul 12, 2021

From Tin-Kei's original merge request:

[Untested] Update tensor product logic in 'projectors_global.py' to use the 'PI()' method.
Clean up 'test_divB.py.'
Fix incorrect indentation in 'domain_3d'.
Add test divB = 0.
'kernel_evaluate_sparse' function added.