Levenberg-Marquardt toolbox

Levenberg-Marquardt algorithm with Broyden updates, box constraints and argument passing.

LevenbergMarquardt is similar to lsqnonlin with the levenberg-marquardt algorithm with the three main advantages:
1) the jacobian can be updated using the Broyden method which minimizes function evaluations
2) the variables are transformed to implement box-constraints, and
3) function arguments can be passed on.
This toolbox requires the Jacobian toolbox of the same author.