BUGFIX: fix a copy-o in build_Item_Ghost(): xbin2, etc. should be an int

    const int ybin = binxyz[1];

    const int zbin = binxyz[2];

    for (int k = 0; k < nstencil; k++) {

      const X_FLOAT xbin2 = xbin + stencilxyz(k,0);

      const X_FLOAT ybin2 = ybin + stencilxyz(k,1);

      const X_FLOAT zbin2 = zbin + stencilxyz(k,2);

      const int xbin2 = xbin + stencilxyz(k,0);

      const int ybin2 = ybin + stencilxyz(k,1);

      const int zbin2 = zbin + stencilxyz(k,2);

      if (xbin2 < 0 || xbin2 >= mbinx ||

          ybin2 < 0 || ybin2 >= mbiny ||

          zbin2 < 0 || zbin2 >= mbinz) continue;