Luc Maisonobe fc9cb0ce16 Value and Jacobian evaluated in a single method.
A new interface MultivariateJacobianFunction lets the function value and
Jacobian be evaluated at the same time. This saves the user from having to cache
the result between calls to get the value and the jacobian.

A factory method was added to create LeastSquaresProblems from the new interface.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1569346 13f79535-47bb-0310-9956-ffa450edef68
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