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Exact spherical harmonics coefficients for weighting function h by Malecki

Cederik Höfs requested to merge cederikhoefs/elsa:analytical-h into master

With the help of Mathematica I could get the analytical terms for eta, so we won't need numerical integration in the setup of AXDTOperator anymore. Tomorrow I'll measure the speed improvement, but I hope my code should be substantially faster... EDIT: No need to measure, it's noticeably faster!

The coefficients finally agree with the numerical integration (modulo normalization)!

Also I refactored getGeometryAt to throw...

Edited by Cederik Höfs

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