Changes

Changed surface to sfc in all instances where requested

Reverted surface to sfc change where applicable

Undid sfc change in stats_sfc_module.F90

Undid sfc change to grid_class.F90

Undid sfc change in numerical_check.F90

This is a unit test for function analyzeSensMatrix

in analyze_sensitivity_matrix.py.  It creates netcdf files with
fake, hardwired data in order to form a normalized sensitivity matrix like:

1 0
0 1
1 1

and then checks whether analyzeSensMatrix returns the expected answer, [ 2/3 2/3 ].

Normalize and transform parameters.
The normalization involves multiplying each column of the sensitivity matrix
by the appropriate parameter, so that the parameter units cancel out.
Transforming involves converting parameters that lie in the range [0,1]
to the range [0,infinity] in order to make the sensitivity more linear.

For #910.

Add function that plots sensitivity matrix elements

Call function to plot sensitivity matrix

Print params and metrics names rather than numbers