Additional arguments

The ``COPY_FROM'' argument for the copy boundary condition is required, so a valid table handle is required as well. The keys read are

key	variable type	description	default value
COPY_FROM	CCTK_INT or CCTK_STRING	GV to copy from	no default
BOUNDARY_WIDTH	CCTK_INT array	stencil width for each face	n/a

(The BOUNDARY_WIDTH table entry is only necessary if the boundary_width parameter is negative.)