SIS2: Merge branch 'nicjhan-diagnostic-tests' into dev/master

- NOAA-GFDL/SIS2@66d58c3 Merge branch 'nicjhan-diagnostic-tests' into dev/master
- NOAA-GFDL/SIS2@0b468a2 Revert "Call diag_mediator_end() to close open files. mom-ocean/MOM6#147"
- NOAA-GFDL/SIS2@620e355 Increase the maximum diagnostics to allow exhaustive diagnostic checking.
- NOAA-GFDL/SIS2@41812db Fix diagnostic tmp array shape. mom-ocean/MOM6#147
- NOAA-GFDL/SIS2@3440869 Call diag_mediator_end() to close open files. mom-ocean/MOM6#147
- NOAA-GFDL/SIS2@4d80387 Array shape mismatches for ice SW diagnostics. Closes #17.