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DenseMatrix: Allow assignment from anything that converts to field_type

Oliver Sander requested to merge fieldmatrix1x1-allow-assignment-fieldvector1 into master

The DenseMatrix class allows assignment from scalars. Anything would be accepted as a scalar for which IsNumber returns true. Unfortunately, this excludes FieldVector<.,1>, which in many other places is expected to play the role of a scalar.

This patch changes the assignment-from-a-scalar logic of DenseMatrix: Any type that is convertible to the field_type of the matrix is now accepted as a scalar. This should still hold for all previous cases, but includes FieldVector<.,1> as well.

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