Intergrate Kess' configure docs in the docs tree and,

in particular, integrate them into install.xml by removing
large chunks of that document and making it a summary
with pointers into configure.xml.

(I also snuck in the odd fix to both install.xml and
configure.xml.  Sorry for the mix.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@103154 13f79535-47bb-0310-9956-ffa450edef68