Implement enclosed mass for PowerSphericalPotentialwCutoff using the hypergeometric function for more stable behavior at (the unphysical) alpha > 3
Implement enclosed mass for PowerSphericalPotentialwCutoff using the hypergeometric function for more stable behavior at (the unphysical) alpha > 3

jobovy/galpy,jobovy/galpy,jobovy/galpy,jobovy/galpy