fix oops

+=====================+=======================================================================+=============+===========+

| plot_int            | Frequency of plotfile output;                                         |    Int      |  -1       |

|                     | if -1 then no plotfiles will be written                               |             |           |

+------------------+--------------------------------------------------------------------------+-------------+-----------+

+---------------------+-----------------------------------------------------------------------+-------------+-----------+

| plotfile_on_restart | Should we write a plotfile when we restart (only used if plot_int>0)  |   Bool      |  False    |

+---------------------+-----------------------------------------------------------------------+-------------+-----------+

| plot_file           | Prefix to use for plotfile output                                     |  String     | plt       |