mod_version_for_2.0.x branch:

* Merge r160788 to r170801 from branches/2.0.x. Docs conflicts revolved
  manually -- never build docs in a branch that's going to be merged back...
* mv 2.0.54 references to 2.0.55
* adjust mod_version copyright notice


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/mod_version_for_2.0.x@170803 13f79535-47bb-0310-9956-ffa450edef68