Fix lumped mass matrix for faces. #371
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jwboth
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The lumped mass matrix for face quantities was computed wrongly. The rationale behind the mass matrix is the lumping of the RT0 mass matrix on Cartesian grids. A careful calculation shows, that what is left is the arithmetic average of the cell volumes of cells to the left and right of each face. It is for now assumed that the grid is equidistant along each axis, such that only the boundary faces need extra care.