Bypass MAPL_LoadBalance when not running load balancing, add maxpasses as resource

[mathomp4]

This PR changes the load balancing code in the Solar GridComp to avoid calls to MAPL_LoadBalance if not running with load balancing on.

As found by @wmputman, if you set SOLAR_LOAD_BALANCE: 0 you technically still call the MAPL_LoadBalance code which involves MPI_Allgather, MPI_Send and MPI_Recv calls. Trivial though they are, at high-res they can be expensive.

So, what we do here is make some changes to avoid this. Testing shows this change is zero-diff if you run with load balancing on.

Also added is code from @wmputman to pass in the max number of passes to the loadbalancer if running it. The default is 100 which is the baked default in MAPL_LoadBalance.F90

Working with @dr0cloud, we have fixed the issue with the odd checkpoints. It is now fully zero-diff.

Working with @atrayano, we have fixed issues with the timers not being happy with no-solar processes going into RRTMG and not triggering the timeron/off.

[wmputman]

Thanks @mathomp4 : your findings on the internal checkpoints is interesting. Those are the no aerosol exports from solar, which is also a burden since it basically calls soradcore twice even when we don't want the clear-sky exports.

[dr0cloud]

Hi Matt and Bill, I’ll take a look shortly. Not all of those are no-aerosol internals. It should NOT call SORADCORE twice if no non-aerosol exports are required. But it may reserve space in the internal state for them. Just grabbing a bite to eat and will take a look. P.

[dr0cloud]

Looks good Matt.