- add the general ability to create zebra tables

  automagically (<table style="zebra">)
- allow some attributes in th (e.g. colspan)
- add ability for <h4> sections
- refuse to transform deeper nesting than h4


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97008 13f79535-47bb-0310-9956-ffa450edef68