- implement DeltaV OPTIONS extensions

- let live prop providers get first crack at PROPFIND
- work around MS Web Folders limit on DAV header length

Submitted by: John Vasta <jvasta@rational.com>
Reviewed by: Greg Stein


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87752 13f79535-47bb-0310-9956-ffa450edef68