[test] Cleanup lagrangeshapefunctiontest

On the one hand the test so far checked several LFE implementations twice, on the other hand, some (e.g. higher order in 1d) where not checked sufficiently. This patch unifies the checks among all checked Lagrange LFE implementations including several cases missing before and making use of Dune::TestSuite. Furthermore all checked LFE implementations are now also checked when wrapped once or twice in the virtual wrapper. While the compile time is increased due to the increased coverage, it's still moderate.

@gruenich You're the last person who did a functional change to this test. Can you have a look?

mentioned in merge request !296 (merged)

One could also add a few improvements to the test: check for other types than double. This reveals some small issues in test-localfe.hh. Especially, with GMPField one needs to do some updated. Should this be part of this MR, or added separately?

I'd rather add this separately. The present MR just cleans up the existing tests and adds missing combinations in the matrix.

When adding more dimension to this (e.g. different field types) we may also evaluate which cases should be tested. Notice that the runtime of the test is fine, but compilation already takes quite a bit of time.

Currently testFE() does not compile at all with Float128 or GMPField<128>. With some patches I can fix this and the tests pass with Float128. But for GMPField<128> I get a segfault. Hence my patches may be incomplete. This needs to be carefully investigated.

Since making testFE() work with other types than double is not the scope of this MR it should be done separately. Once it works we can easily call this from the cleaned up lagrangeshapefunctiontest.

merged

mentioned in commit a798d7f4