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.

web: provide the file number to the diffstat templates This allows the diffstat templates to link into the diff output. For example, the URLs of the first three files within the diff are #l1.1, #l2.1, #l3.1.

web: include all files in the diffstat The webutil.diffstat function now returns a diffstat template for each file in the diff. It previously returned a template for each file returned by ctx.files() which did not work well for merge changesets.