doc: update tracker_config.txt Every generation of tracker_config.txt also changes the secret_key value. To prevent this from showing up in diffs, modify format_config.awk to use a static value for the secret_key and substitute it into the config file. Also update Makefile so tracker_config.txt depends on format_config.awk.

License
=======

Roundup is Free Software under the following license (from the
file COPYING.txt in the software distribution):

.. raw:: html

   <div class="file_insert">

.. include:: ../COPYING.txt

.. raw:: html

   </div>