Remove MySQL specific code from site generation code

- site-generator is generic, so no changes.
 - removed mysql information from site.cfg.
 - Updated template files to call sqlite queries directly.
 - Renamed the query files - remove sqlite from file names.
 - Deleted MySQL specific template files.

templates/content-comments_viewer.tpl.html

@@ -1,8 +1,9 @@
 <!--% PROCESS 'shared-episode-summary.tpl.html' %-->
 <!--% PROCESS 'shared-utils.tpl.html' %-->
 <!--% PROCESS 'shared-listen-now.tpl.html' %-->
-<!--% PROCESS "queries-episode-${constants.database}.tpl.html" %-->
-<!--% USE DBI(constants.driver, constants.user, constants.password) %-->
+<!--% PROCESS "queries-episode.tpl.html" %-->
+<!--% USE DBI(constants.driver) %-->
+
 <h2>Comment Viewer</h2>
 <p>Because of the spammers we have had to turn on comment moderation. Sorry about the delay this will cause.</p>
 <p><a href="<!--% absolute_path(baseurl) %-->comments.rss">Subscribe</a> to the comment feed.</p>