Sync with the latest Apache/mod_dav changes (by John Vasta), and add a response to the DAV:activity-collection-set OPTIONS request.
Sync with the latest Apache/mod_dav changes (by John Vasta), and add a
response to the DAV:activity-collection-set OPTIONS request.

(dav_svn_set_target): removed. it is now "update" and is optional, and we
  won't ever support it, so it goes away.
(dav_svn_add_label, dav_svn_remove_label): we won't provide support for the
  LABEL method (although we will support DAV labels as server-applied
  items), so these functions go away.
(dav_svn_hooks_vsn): revise the list of hook functions, per above.
(dav_svn_get_option): add response code for the DAV:activity-collection-set
  OPTIONS request.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@839074 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion