Hp50g global min and max solver

[rkf]

I still remember Gjermund's brilliant Curve Fitting Library (for the HP48/49, April 2000) and thus I'm absolutely sure his new global maximum and minimum and root solver is also unbeatable regarding efficiency.

Yet installing a custom ROM version is a non neglectable obstacle, at least for me. But I really hope that nevertheless some volunteers support the beta testing. Good luck!