- added answer about "missing" REMOTE_USER variable

- incorporated 8 answers from the old mod_rewrite FAQ
  (step 4 of the mod_rewrite gifting procedure)
- adjusted the Netcraft information about number of Apache servers
- fixed typos


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@78773 13f79535-47bb-0310-9956-ffa450edef68