Coupling to missing realms

[davidhassell]

It is desirable to describe coupling information from a "missing" realm to an actual realm. E.g. in an atmosphere only model, we might want want to record how the prescribed SSTs are coupled to the atmosphere.

This is currently not possible, as only the modelled realms are in the spreadsheet pull down menu. However, I think that the CIM is OK with this, as the realms are just identified by strings (https://github.com/ES-DOC/esdoc-cim-v2-schema/blob/master/science_classes.py#L72).

I think putting all 8 realms in all pull down menus would be acceptable.

Solution:

• [ ] include all 8 realms in the "source" pull down menu. (The "target" menu remains unchanged in having subset of the realms.)

• [ ] Change the "Coupling details " column title to read "Coupling or interface details "

• [ ] Modify coupling documentation on wordpress to reflect the new order

[davidhassell]

All 8 realms in just the "source", not target.

Also update guidance on wordpress, and the name of the "coupling details" column: "Coupling/forcing details"

[davidhassell]

Issue description updated with checklists of tasks