Changes

Add sample commands to read in metrics and parameter values
from a netcdf file.  Uses scipy's netcdf commands, which
are based on pupynere.  I couldn't figure out how to store
these values as scalars in my sample netcdf file, so
instead they're stored as length-1 arrays.  Hence the
sample read commands need to extract the "0" element
of these length-1 arrays.  Maybe a more elegant solution
can be found in the future.

The sample commands are commented out, and so
the solution shouldn't change.

For #910.