New Module -- mod_logio.

This adds the ability to log the bytes sent and
received for each request

Submitted by:	Bojan Smojver <bojan@rexursive.com>
Reviewed by:	Justin & Ian


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97000 13f79535-47bb-0310-9956-ffa450edef68