Miscellany

        for( i = 0; i < i_me_range/3; i++)
        {
        omx = pmx = bmx; omy = pmy = bmy;
        COST_MV(omx-3,omy-3);
        COST_MV(omx-3,omy+3);
        COST_MV(omx+3,omy-3);
        COST_MV(omx+3,omy+3);
        COST_MV(omx-2,omy-2);
        COST_MV(omx-2,omy+2);
        COST_MV(omx+2,omy-2);
        COST_MV(omx+2,omy+2);
        COST_MV(omx-1,omy-1);
        COST_MV(omx-1,omy+1);
        COST_MV(omx+1,omy-1);
        COST_MV(omx+1,omy+1);
        if( bmx == omx && bmy == omy )
            break;
        if( !CHECK_MVRANGE(bmx, bmy) )
            break;
        }
        DIA2_ITER(bmx,bmy);