simplify code a little and remove excess whitespace

  if (idnext) find_maxid();

  // random number generator, same for all procs

  // warm-up the generator 30x to avoid correlations in first-particle 

  // warm up the generator 30x to avoid correlations in first-particle

  // positions if runs are repeated with consecutive seeds

  random = new RanPark(lmp,seed);

  double tmp_rand;

  for (int ii=0; ii < 30; ii++) {

    tmp_rand = random->uniform();      

  }

  for (int ii=0; ii < 30; ii++) random->uniform();

  // set up reneighboring