Remove old dune-fufem bases

They are getting removed now for good after the release of dune-fufem 2.9. The code that replaces them has been there for quite a while, and therefore we can simply use it without having to worry about compatibility with older dune-fufem versions.

added 1 commit

• 54e2e1a1 - Replace FieldMatrix<,1,1> by scalars

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added 5 commits

• 54e2e1a1...92f0d5f5 - 2 commits from branch master
• eb84290c - Remove old dune-fufem bases
• a3cce20f - Replace FieldMatrix<,1,1> by scalars
• 7c64d137 - Test against Dune 2.8 instead of Dune 2.7

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added 1 commit

• 8ed397cd - Also CI-test with the 2.9 release

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This still fails with the 2.8 release (which I still think is important, because 2.8 is what is in Ubuntu/Debian right now), but I am going to merge now anyway. It is a definite improvement, and I'll worry about 2.8 later.

merged

mentioned in commit 7b1fd434