Several improvements:

- some better descriptions
- reorder the enable/disable module options
- add --with-dbm options
- some nits

note: this is 2.0. changes in 2.1, e.g. auth modules, are still missing


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@101857 13f79535-47bb-0310-9956-ffa450edef68