NewFeatures: Chronological entries

The RecentChanges DWikiText macro now accepts additional arguments that are the list of directories to restrict the listing to, or with a dash at the front, directories to exclude from the listing. If you combine both, both criteria must match: in an included directory and not excluded.

This lets a RecentChanges listing exclude areas that churn too much or are otherwise less interesting to list. (Perhaps, for example, a blog sub-hierarchy in a DWiki.)

If there is a common directory prefix that scanning is limited to, the scan is efficient: only that directory and lower is looked at at all.

Template expansion via #{...} now removes a final newline if such a final newline is present. (It doesn't remove more than one newline.)

The final newline is really an implementation artifact of files; it's there because lines end with newlines, not because people consider it to be part of the file's real content. Deleting it thus brings template expansion closer to inserting people's idea of the file's contents into place.

It also means that we avoid having templates introduce whitespace into undesired places. For example:

[There's more starting at %{blog::seemore}#{blog/rangemore}]

and blog/rangemore of:

or %{range::moreclip}

doesn't introduce a gap between the end of %{range::moreclip}'s output and the ']' in what the browser displays. (See how we didn't think of blog/rangemore as actually having a newline at the end as part of it?)