Merge branch 'jayeshkrishna/driver/change_default_to_cdf5' into next …

…(PR #6525)

Re-merging branch to fix nightly test fails on mappy.

The CDF5/64bit_data format gets rid of limitations (for all practical
purposes) on NetCDF variable size imposed by the older
CDF2/64bit_offset file format.

Also updating SCORPIO to v1.6.5

[BFB]
[NML]

* jayeshkrishna/driver/change_default_to_cdf5:
  Upgrading to SCORPIO v1.6.5