Update to use v3_06_11 matfile data and checks
- Added make_data_from_mat.py to generate new SAAR and check value
files from the matfile included in the matlab release zipfiles.
- Substituted the newer gsw_geo_strf_dyn_height_1 with the pchip
option as the engine for the dynamic height calculation, replacing the
original that dated from a much earlier version. It gets closer to
the current check values than the old version, but not nearly close
enough to pass the tests; since more development on this is expected,
the test is left here with the failure in place.
- Made small changes to 2 second derivative calculations for improved
numerics. New check values are not needed.