CMORsnack: all variables, omission tracking, offline diag compatibility

[ilaflott]

this can be broken down into bits

- [ ] CMORsnack: offline diag compatibility (link)
- [ ] CMORsnack: omission tracking pushing to the cmorMEAL step coming next
- [ ] CMORsnack: success across almost all, if not all, variables, including offline diags changing this description a little bit.

• success across many variables, including ones with GFDL-isms.
  CMORsnack: success across almost all, if not all, variables #268

• nc_copy bug
  CMORsnack: fre.cmor.cmor_mixer.nc_copy bug #250

• more flexible treatment of lat, lon, and their _bnds
  CMORsnack: fre cmor programmatically reading "bounds" of a coordinate #241

• netCDF file format handling- how? during nc_copy
  CMORsnack: netCDF file format handling in cmor_mixer #238