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[bugfix] Add missing specialization FieldTraits<MultiTypeBlockMatrix>

Carsten Gräser requested to merge bugfix/implement-multitypeblockmatrix-fieldtraits into master

Notice that this also fixes an incorrect MultiTypeBlockMatrix::field_type in a special setting: If you have a nested matrix MultiTypeBlockMatrix< MultiTypeBlockVector<MultiTypeBlockMatrix<...>>>, the outer MultiTypeBlockMatrix::field_type forwards to the MultiTypeBlockVector::field_type which forwards to the inner FieldTraits<MultiTypeBlockMatrix>::field_type. Without this fix, the latter is just the inner MultiTypeBlockMatrix, due to the nonsense default-value of FieldTraits.

Edited by Carsten Gräser

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