[Mass] Support matrix lumping in FEMMass - #6264
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Mass matrix lumping = diagonal matrix.
If the matrix is diagonal, it can be inverted trivially, and that's what we need in
accFromF.Mass lumping is most useful in explicit dynamics. I tried to make an example, but it's always unstable. So, I made a comparison between consistent and lumped masses using an implicit solver. I don't see any difference visually.
[with-all-tests]
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