SHOC-MF updates

[narnold1]

Various updates to the SHOC-MF turbulence code, improving stability and model climatology. These include: Code cleanup, improvements to the ADG PDF, added approximate EDMF source tendencies in the trisolver, raised the maximum EDMF altitude to 3km, set EDMF QT3 and HL3 to zero below cloud base, reduced profile sensitivity in the EDMF entrainment depth calculation, used the full TKE instead of environment portion in the KH calculation, SHOC turbulence length scale based on local parcel length instead of mixed layer depth, set minimum QT2 to 3% of QT, and added missing w term to the Canuto w3 calculation.