Invert Bertin1953, Chamberlin, interruptedSinuMollweide #181
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… with an approximate 2-d Newton-Raphson method.
The general Jacobian inversion method is detailed in Ipbuker & Bildirici 2002
In this implementation, I added a dampening factor when the determinant is too small — which helps with convergence near the singularities of the projection.
Inspired by Robert B. Schmunk’s work on the Bertin1953 inverse for G.Projector, which showed it was possible.
closes #85 (at long last)