setup()

subroutine module_h2ophys::setup	(	class(ty_h2ophys), intent(in)	this,
		real(kind_phys), dimension(:), intent(in)	lat,
		integer, dimension(:), intent(out)	idx1,
		integer, dimension(:), intent(out)	idx2,
		real(kind_phys), dimension(:), intent(out)	idxh )