Symmetric gradient operator for divB used in divergence cleaning ; also adapt...

Symmetric gradient operator for divB used in divergence cleaning ; also adapt psi time integration to couple properly to this change

added MHD label

requested review from @nshchutskyi

assigned to @matthieu

@nshchutskyi can you confirm this is what you are running in your cloud tests? Or are there additional differences?

resolved all threads

added 51 commits

• 62a33c7f...2df3e4e8 - 49 commits from branch MHD_canvas
• 0391fae2 - Applied code formatting
• 061a9f88 - Merge branch 'MHD_canvas' into karapiperis/symmetric_divB_cleaning

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I have left a couple of questions to answer before merging.

added 1 commit

• a5f4475b - Zeroing divB put back in

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resolved all threads

mentioned in commit 546cfdac

merged