rename open_ifs to open_nwp

[peterdudfield]

Good to rename open_ifs to open_nwp. We should define in the read me what the data should look like.
Currently both ECMWF and MO global load using open_ifs

[ram-from-tvl]

Hi @peterdudfield
Can I take up this issue.?
Thank you!

[kartavayv]

Hi!

Is anyone working on this issue...?

I would like to contribute if no one is!