Cost gradient support #936
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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
gradof the Minuit constructor.