Change camstats so that output can be written to any type of text file, along...

    Keep in mind that sparse increments assigned to LINC and SINC are 

    susceptible to an adverse effect on the accuracy of the statistics.

    </p>

    <p>

    The statistics are output both to the screen and to the print.prt file in PVL format.

    Additionally, if the user specifies a file using the TO parameter, the statistics are written to

    that file in PVL format (default) or as a comma-separated-value text file (FLAT file), depending

    on the FORMAT parameter.

    </p>

    <p>

    If the output file exists and the APPEND parameter is set to "no", the contents will be

    overwritten.

    </p>

  </description>

  <history>

      Updated FORMAT and APPEND documentation to be more clear. Made general

      edits for clarity.

    </change>

    <change name="Andrew Stebenne" date="2015-04-03">

      Removed the filter on the TO parameter so that any file can be used for output. Updated

      documentation to clarify the existence and functioning of a few quirks. Addresses redmine

      ticket #175.

    </change>

  </history>

  <category>

          Alternatively, the output can be written to a text file format, 

          see the "FORMAT" parameter for more information.

          </p>

          The format is ignored unless the "TO" parameter is specified.

        </description>

        <filter>

          *.txt *.TXT

        </filter>

      </parameter>

      <parameter name="FORMAT">

        <type>string</type>