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Timo Koch requested to merge feature/volume into master

Introduces a helper function to compute the volume of convex polytope geometries. For common convex polytope geometry types there are efficient helpers. A generic method uses the volume() function of the geometry as fallback if a specialized volume function is not implemented (although we cannot guarantee that that method actually returns a good volume approximation.

The helper is called convexPolytopeVolume since it only works correctly for convex polytopes. There is also a helper that uses integration on the reference element to determine the volume for nonlinearly transformed geometry types. For box we only supported and continue to support convex polytopes.

Edited by Timo Koch

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