backport:

- reintroduced the sidebar for the module index page (obvious ;-)
  * didn't want to leave the section links so alone, thus added some
    <seealso>s.
- changed the ordering of the core/MPMs as follows:
  * core
  * mpm_common
  * alphabetical list of the mpms (ordered by their "natural" names).
- same appeared on the sitemap
- changed <h1> headings of the modulesynopsis files, so that they match the
  titles in the sitemap. This should better reflect the nature of the
  modules. (affects only core & MPMs)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@98081 13f79535-47bb-0310-9956-ffa450edef68