Move fire maps from surface dataset to stream files

[samsrabin]

As Fang has updated some inputs, it'd be nice to move them to streams files rather than having to update them on all the surface datasets.

• peatf (peatland fraction)
• abm (agricultural fire peak month)
• gdp (gross domestic product)

[ekluzek]

As a starting point you should probably start with the half degree datasets being used by mksurfdata_esmf. That'll provide a nice transition from what's currently being done, to new higher resolution datasets to be used in the future.

Is this change really needed for the Capability freeze? I suppose it might so we don't have to make new surface datasets if updated datasets are required. This might be something good to discuss, so I'll add the next label to it...

[samsrabin]

It's only needed for the capability freeze because it needs to happen before I bring in new datasets from Fang—as you said, because I don't want to have to make all new surface datasets for this.

[wwieder]

These fields should be removed from the 5.3 datasets too, @lawrencepj1 and @slevis-lmwg.

[ekluzek]

We will include the new data on the ctsm5.3.0 surface datasets. But, after ctsm5.3.0 this change will come in which will enable clm4_5 and clm5_0 to be closer to what they were previous ctsm5.3.0.

[samsrabin]

These will be available on the half-degree surface datasets produced from #2500.