Fix a bunch of bugs :-) Single version of conjugate gradient with golden search linesearch pass a couple of functions test. Brent's algorithm is still broken
NLModel0, NLModel1 pass uit test
to avoid cyclic depency, refactory constraint class
using class Minimizer1D derived from MinimizerBase instead of a functor to do line seach
Revision of NLModel0 and NLModel1
revision of NLModel
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