Convert UW PBL (diag_TKE) scheme

[jimmielin]

Companion issue in CAM ESCOMP/CAM#1429

[jimmielin]

I didn't port wsedl from RK (CAM4) since it was unused but it is an input in UW PBL (CAM5). Could probably add wsedl to RK so it could potentially be mix-and-matched with UW