scikit-hep / iminuit / 6023045653

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Cost gradient support (#936)

Add gradient support for all builtin cost functions except the Template
cost function (whose gradients may be added later).

Gradient support means the following. You can now pass a user-defined
model gradient to each supported cost function. Minuit will
automatically detect whether the gradient is available and make use of
it. This behavior is now properly documented and can be overridden by
passing a boolean to the keyword `grad` of the Minuit constructor.

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