forward-port John Vasta's checkin to mod_dav 1.1.x (on Sep 25, 2000). this

begins some work to upgrade the versioning support to some of the more
recent drafts.

- get_resource hook has new params
- create_collection hook no longer takes a pool
- new dav_auto_version_info structure to group up autoversion
  rollback/commit handling data
- new functions for getting workspace, target-selector, etc
- supportedlock hook now takes the resource in question (since different
  resources may have different locks)
- new resource types; tweaks in props.c to support them
- some tweaks with resource creation, Location header, etc.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86424 13f79535-47bb-0310-9956-ffa450edef68