* Added support for layer summaries.
    * Added a "Index" link on the menu to link to index.html
    * Added links from the master interface & template lists
      to their respective documentation in their module.
    * Added links to "Interfaces" and "Templates" in modules
      that have both.
    * Added "Return" links after the "Interfaces" and "Templates"
      section that go to the top of the module site.