plug memory leak in fix bond/react

  global_megasize = 0;

  int *allncols = new int[nprocs]();

  int *allncols = new int[nprocs];

  for (int i = 0; i < nprocs; i++)

    allncols[i] = 0;

  MPI_Allgather(&ghostly_num_mega, 1, MPI_INT, allncols, 1, MPI_INT, world);

  for (int i = 0; i < nprocs; i++)

    global_megasize = global_megasize + allncols[i];

  if (global_megasize == 0) return;

  if (global_megasize == 0) {

    delete [] allncols;

    return;

  }

  int *allstarts = new int[nprocs]();

  int *allstarts = new int[nprocs];

  int start = 0;

  for (int i = 0; i < me; i++) {