further fixes to scaling, added disturbance rejection and started uncertainty analysis
General clean up, and addition of Nyquist plots
More clean up and improvement on the look of the plots
Added performance Bode plots and fixed Nyquist plots
Initial commit of uncertainty description and uncertainty weighting function
Added the full SVD that returns U, S and V.  U = output singular vetors, S = singular values and V is the conjugate transpose of VH.
Incorporated the use of the SVD wrapper in utils.py and cleaned up the SVD calls in the script