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make linear_algebra backend packages required if BACKEND is selected

Merged Praetorius, Simon requested to merge issue/cmake_backends_required into master

If a linear algebra backend is selected using the -DBACKEND=... cmake flag, the find_package should be REQUIRED. Also, if neither Eigen nor MTL is selected, the fallback dune-istl must be available.

Edited by Praetorius, Simon