adding function shakeF in order to remove the constraint force along bond direction
single version of energy minimization is working.
Single version of energy minimization for argon is working, need to add constraint
Add some lines into global.cpp to make it work with energy minimization
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
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