KERNEL TRUNCATION/LCOARSEN
KERNEL_TRUNCATION/LCOARSEN_BEFORE_PAD = .True. | .False.
Default: KERNEL_TRUNCATION/LCOARSEN_BEFORE_PAD = .True.
Description: KERNEL_TRUNCATION/LCOARSEN_BEFORE_PAD speeds up computation of the local potential in the kernel truncation method by coarsening the charge density before padding it.
Kernel truncation methods require a fixed amount of vacuum in the cell.