necessary because older restart files have a different format
valid settings are 2001 (LAMMPS 2001), 2000 (LAMMPS 2000),
  6 (LAMMPS 99) or 5 (LAMMPS 5.0)
restart files from earlier versions of LAMMPS are not readable without
  some source code modifications
restart files are always written out in the current-version format
  regardless of this setting
this must be set before the &quot;read restart&quot; command is executed

Default = current version of code = 2001
</PRE>
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