Init uvRelativeToGrid.

src/griddes.c

@@ -78,6 +78,7 @@ void gridInit(griddes_t *grid)
   grid->xdimname[0]   = 0;
   grid->ydimname[0]   = 0;
   grid->vdimname[0]   = 0;
+  grid->uvRelativeToGrid = false;
   grid->scanningMode  = 64;
   /* scanningMode  = 128 * iScansNegatively + 64 * jScansPositively + 32 * jPointsAreConsecutive;
                64  = 128 * 0                + 64 *        1         + 32 * 0