check-code: Only call check-code if __name__ = "__main__".
This changeset moves the code that actually executes something to the
"if __name__ = '__main__'" section to allow the file to be imported as
a module.
<tr class="parity{parity}">
<td class="age">{date|age}</td>
<td class="author">{author|person}</td>
<td class="description"><a href="{url}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}</a>{inbranch%changelogbranchname}{branches%changelogbranchhead}{tags%changelogtag}</td>
</tr>