Added a script and log for calculating the numerical chi-squared Jacobian for an exponential curve.
This uses the data at http://thread.gmane.org/gmane.science.nmr.relax.devel/6807/focus=6840 and
calculates the chi-squared Jacobian using the numdifftools.Jacobian object construct and obtain the
matrix, both at the minimum and at a point away from the minimum. The values will be used to
construct a unit test to check the C module implementation.