add cmake build to Data Atmosphere

[aerorahul]

This PR:

• build's data atmosphere component with cmake.
• fixes a GNU error in datm.F90, where a non-negative integer needs to be provided. This is a similar error we saw in MOM6 nuopc cap.

There is no change in results.

[DeniseWorthen]

I'm not sure we'll want to carry the tools directory forward. That is the tool I initially created to convert the nemsio to netcdf for the datm input. But Hyun-Chul developed a different tool so I believe the tools/ is no longer needed. His scripts were located in the utilities directory of the app.

[binli2337]

I think the files in tools might be useful in the future.

[aerorahul]

I'm not sure we'll want to carry the tools directory forward. That is the tool I initially created to convert the nemsio to netcdf for the datm input. But Hyun-Chul developed a different tool so I believe the tools/ is no longer needed. His scripts were located in the utilities directory of the app.

@DeniseWorthen is correct.
Should we bring the utilities directory from the App into this repo? I can anticipate use for the IDL and @hyunchul386 forcing creator still be useful. Thoughts?