teps 
    <LI>
    2nd parameter = 1 or 2 = naming convention for restart files
    <LI>
    3rd (and 4th) parameters = file name(s)
</UL>
<PRE>
create a restart file every this many timesteps
value of 0 means never create one
if the style is 1, restart information will be written to files
  named filename.timestep and no 4th parameter is needed
if the style is 2, restart information will be written alternately to files
  given by the 3rd and 4th parameters, so only 2 restart files ever exist
when the minim