SYNOPSIS:
    MARKCG_FILL_BOUND_NORM startvoxel maxdist maxdev :                            from to border [minanz] [breakonfirst]

DESCRIPTION:
    Flood fill from startvoxel, remark as "to" as long as the
    Voxel neither exceeds maxdist nor maxdev.
    Voxels that fail teh check are marked as "border".
