Fixed x-y bug for force

Miha

2016-07-15 c372c14d1f552a3219a733394141179c9e800683

 src/frame.c

@@ -42,6 +42,10 @@
         vesicle->filament_list->poly[i]->vlist->vtx[j]->z-=vesicle->cm[2];
      }
    }
//move nucleus for the same vector as we moved vesicle
   vesicle->nucleus_center[0]-=vesicle->cm[0];
   vesicle->nucleus_center[1]-=vesicle->cm[1];
   vesicle->nucleus_center[2]-=vesicle->cm[2];

    vesicle->cm[0]=0.0;
    vesicle->cm[1]=0.0;