* Make aggregator save permalinks and author name to pages as metadata.

* Make aggregator save permalinks and author name to pages as metadata.
* Add permalink and author support to meta plugin, affecting RSS feeds
  and blog pages.
* Change titlepage() to encode utf-8 alnum characters. This is necessary
  to avoid UTF-8 creeping into filenames in urls. (There are still
  some other ways that it can get in.)