Remove tautmsx/y from atmos_phys schemes

[jimmielin]

During review of #370, @nusbaume originally wrote:

...if we go with the scientists' plan then we won't be CCPP-izing TMS at all (as the CAM5 suite will just use Beljaars). Thus it might be good to actually get rid of all TMS operations that aren't directly needed by CAM.
Of course I realize that doing this cleanup could take a lot of work, so I am happy if we add this to a "future work" issue. I just wanted to bring it up now before I forgot again.

I think this also ties to #309 to a less extent