Fix HelmholtzDerivativeTaker (#108)
* Fix HelmholtzDerivativeTaker * Use 2, 3, 4 for 2D * Divide by r**2 at the end * Write the recursion as one expression
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* Fix HelmholtzDerivativeTaker * Use 2, 3, 4 for 2D * Divide by r**2 at the end * Write the recursion as one expression