Add some Laplace-Beltrami-type operators (#115)
* add some Laplace-Beltrami-type operators * add test for Beltrami operators * fix mean_curvature usage * update test parameters to ensure some convergence * add dim argument to beltrami operators * add docs to beltrami operators * add generic right-preconditioning * add tests for 2d beltrami solutions * beltrami: unify left and right preconditioning * uses a sphere of radius 1.5
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