soil (and snow?) temperatures in units of Kelvin throughout ; do not write TSURF into "offline" catch restarts

[gmao-rreichle]

Work with the GCM group to convert all soil (and snow?) temperature EXPORT variables outside of catchment.F90 into units of Kelvin.
Currently, units are changed only at the level of the Surface Grid Comp or in the GEOSldas Ensemble GridComp, which is confusing because some EXPORTS are in Celsius and others in Kelvin.

[smahanam]

@weiyuan-jiang are you going to do this? Let me know if you want me to do it.

[gmao-rreichle]

@smahanam : Because this change isn't guaranteed to be zero-diff, it's probably better to wait. I first need to talk with Scott to figure out a good opportunity to get this adopted into the GCM.

Another thing: When working on the GCM Grid Comp, we should also change the code such that TSURF is no longer written into "offline" catch restart files. This can be done by changing

RESTART = MAPL_RestartRequired

to

RESTART = RESTART

in the InternalSpecs definition of TSURF.

[smahanam]

TP1, TP2 ... are model diagnostics. This modification should pass AGCM zero-diff.
Perhaps, GEOSldas nightly test will fail, because the nightly tests (I think) diff all files.

[gmao-rreichle]

@smahanam : It's true that this is zero-diff in terms of restarts. I'm not sure what exactly is tested for the AGCM. I also don't know if the AGCM team would accept a change that impacts diagnostics as easily as a truly zero-diff change. I hope to catch up with Scott next week and come up with a plan for getting this and other current, land-related "issues" into the GCM.