- apply various table and formatting fixes, which halted the pdflatex run
- also add mod_filter_old.png (converted from .gif), required for inclusion in
  latex


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1562436 13f79535-47bb-0310-9956-ffa450edef68