Should remove unused `vd_lu_decomp` subroutine.

[nusbaume]

Issue Type

Code Clean-up

Issue Description

While looking through CAM's vertical diffusion code I found the subroutine vd_lu_decomp in vdiff_lu_solver.F90. However, I am unable to find any location in the CAM source code where it is used (instead everything uses fin_vol_lu_decomp), so it would probably be good to remove it.

Will this change answers?

No

Will you be implementing this yourself?

Any CAM SE can do this