d file
allows continuation of a previous run
file is binary to enable exact restarts
do not have to restart on same # of processors, but can only do exact
  restarts on same # of processors due to roundoff
when restart file is read, warnings are issued if certain parameters
  in the restart file do not match current settings (e.g. newton flag,
  dimension, periodicity, units) - this usually indicates an error
the restart file stores the &quot;nonbond style&quot; and many-body styles and
  coefficients and c