Land Use Fixes

[ckoven]

I've been running into various errors in transient historical runs with full land use. The branch I am using has various things that aren't on main yet, so I thought I'd cherry-pick just the land-use-relevant things into a separate branch, so that if others want to use them they can.

In addition to the bugfixes, this deletes a bunch of history variables that apply only to secondary lands, and replaces a subset of them (biomass, burned area, GPP, NPP) with ones that have a land-use dimension to them.

Note that there is also one ELM-side bug fix as well, at the commit pointed to in #1260.

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[samsrabin]

Very nice, Charlie, thanks! I just have a few minor notes that I'll propose (untested) fixes to in a PR shortly.