ans never call this particular routine
this command causes any previous file associated with this user routine
  to be closed
new filename can exist, will be overwritten
if the file name specified is &quot;none&quot;, then no file is opened
each routine that is added to diagnostic.f and enabled with a
  &quot;diagnostic&quot; command will be called at the beginning and end of
  each &quot;run&quot; and every so many timesteps during the run
see *** comments in diagnostic.f for changes that must be made in 
