### GSL2 use new Jacobian function gsl_multifit_fdfsolver_jac

Function #'jacobian calls GSL2 function gsl_multifit_fdfsolver_jac with a second optional argument, this argument is the matrix into which the jacobian is written. If it is NIL, than the matrix is created with the new function #'make-jacobian-matrix. Covariance calculation #'ls-covariance calls #'jacoabian as in GSL1, but needs to pass result to #'mpointer to get a C pointer. To avoid reallocating covariance matrix repeatedly, call #'make-jacobian-matrix outside the iteration loop and pass as argument to ls-covariance, as shown in example #'nonlinear-least-squares-example.

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