mod_dav improvement: make dav_method_propfind stream its response, rather than cache every <response> object and send the whole 207 at once.
Looks okay at first glance modulo some style nits.
One potential worry is that by adding to the dav_walker_ctx in the middle of the structure, are we going to bust binary compatibility for mod_dav modules that worked with 2.0.42+? IIRC, mod_dav modules can access dav_walker_ctx. (Not a factor for 2.1, but maybe for 2.0.) -- justin
