Fix issue2551029 (Jinja2 template install error) by deleting config.ini from all templates. Looks like classic and minimal never included a config.ini. Presence of config.ini stopped 'roundup-admin install' from generating an up to date config.ini. Created special option class for backend database. Comment now uses roundup.backend.list_backends to give user indication of valid values. Also we now get an error if user specifies invalid backend. Moved backend setting to top or [rdbms] section. It is the most important thing in there and if set to anydbm (or some other non-rdbm) the rest of the settings can be ignored. Change rdbms config section comment to indicate that the backend setting was used by other database backends. (e.g. if set to anydbm).

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Roundup: an Issue-Tracking System for Knowledge Workers
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Contents
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.. toctree::
   :maxdepth: 2

   features
   installation
   upgrading
   FAQ
   user_guide
   customizing
   admin_guide
   debugging
   xmlrpc
   rest
   overview
   Design (original) <design>
   developers
   tracker_templates
   Notes about the MySQL Database backend <mysql>
   Notes about the PostgreSQL Database backend <postgresql>
   glossary
   acknowledgements
   Richard Jones implementation notes <implementation>
   license