gfdl-only specialty tests progress, the calls of which are seen in [run_test_file_cases.py](https://github.com/NOAA-GFDL/fre-cli/blob/217-the-cmorbite-one-variable8-grids/run_test_file_cases.py) - [x] 1. land gr1 / Lmon / gr1 - [x] 2. atmos gr1 / Amon / cl (full vertical levels) - [x] 3. atmos gr1 / Amon / mc (half vertical levels) - [ ] 4. atmos gr1 / Amon / ta - [ ] allow no-lon coordinate axis case - [x] 5. ocean gr / Omon / sos - [ ] 6. ocean gn / Omon / sos - [ ] `nc_copy` bug - [ ] 7. ocean gr / Omon / so (three dimensional ocean) - [ ] `nc_copy` bug - [ ] 8. atmos gn / Amon / ch4global - [ ] allow no-lon coordinate axis case - [ ] allow no-lat coordinate axis case - [ ] 9. LUmip gr1 Emon / gppLut - [ ] come up with an edge-case work around for non-typical coordinate in place of a more typical vertical coordinate