Added new hole-filling method which takes TKE from up2 and vp2 (#1217)
Added new hole-filling method which takes TKE from up2 and vp2 CLUBB ticket #1165
BIT_CHANGING if flag `l_wp2_fill_holes_tke` is set to true Introduced new flag `l_wp2_fill_holes_tke` to turn on new wp2 hole-filling subroutine that takes TKE from up2 and vp2.