paper, coal: define the diffstat templates
The templates output the filename, the total number of changes to the file
and a bar graph of the adds and removes. The filename is a link into the diff
output.
The diffstat is not yet displayed, but it can be manually added to the
changeset page template.
<tr class="parity{parity}">
<td class="diffstat-file"><a href="#l{fileno}.1">{file|escape}</a></td>
<td class="diffstat-total" align="right">{total}</td>
<td class="diffstat-graph">
<span class="diffstat-add" style="width:{addpct}%;"> </span>
<span class="diffstat-remove" style="width:{removepct}%;"> </span>
</td>
</tr>