walker_death_spawn Subroutine

    subroutine walker_death_spawn()
        ! this routine is for the 2nd RK step, in which the list k2, which
        ! has to be combined with the original y(n) walker list, is created
        ! since the diagonal death/cloning step cannot be done on the currently
        ! iterated on list y(n) + k1/2, treat the diagonal step, like a spawning
        ! step and store it also in the spawned array
        ! possible considerations: maybe the original spawned list is then
        ! too small, if we have a really big y(n) + k1/2 list, from which
        ! essentially all determinants get stored into the spawned list
        ! during the death/cloning step..
        ! talk about that with ali!

        character(*), parameter :: this_routine = "walker_death_spawn"

    end subroutine walker_death_spawn