Dynamic callbacks for nonlinear-least-squares
Dynamic callbacks now operational for nonlinear-least-squares, test passes. Callback struct slot name(s) and value(s) now properly set in pure function calls, even though this only affects Monte Carlo, which doesn't care whether the dimension is set or not. The first optional argument to the mobject maker generated by #'mobject-maker can now have a default value, and the settingp will be added correctly.
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