* groupdav_propfind.c: PROPFIND on a collection now utilizes

* groupdav_propfind.c: PROPFIND on a collection now utilizes
the 'DAV:' namespace as the default namespace instead of defining a prefix.
* groupdav_get.c: GET operations on a single object now make use of the
  begin_burst() and end_burst() wrappers, which will cause a proper Content-length:
  header to be output, and also allows compression to take place.