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Add jacobian()... to SPGrid's geometry implementations

Carsten Gräser requested to merge feature/implement-jacobian into master

This avoids the deprecation warning of the default implementation. The new methods return transposed views storing references to the (cached) results of jacobianTransposed() and jacobianInverseTransposed(). Those views provide optimal implementations for right-multiplication to a FieldMatrix in the sense that they rely on the (hopefully optimally implemented) mv() method of the wrapped matrix.

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