Added faster method for inverting symmetric matrices #56
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Fixes #55. The implementation was taken from here: https://stackoverflow.com/a/58719188 with some minor improvements. It also raises a `LinAlgError` if the matrix is singular.
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Fixes #55.
Currently only the
FisherDerivative.fisher_matrixmethod uses it, but it could probably also be used byFisherMatrix.inverseas well.