Clarify precedence for template/style in commands.show_changeset():
Display format will be the first non-empty hit of:
1. option 'template'
2. option 'style'
3. [ui] setting 'logtemplate'
4. [ui] setting 'style'
If all of these values are either the unset or the empty string,
regular display via changeset_printer() is done.
<div class="page_footer">
<div class="page_footer_text">#repo|escape#</div>
<a class="rss_logo" href="?cmd=changelog;style=rss">RSS</a>
</div>
</body>
</html>