add proppatch handler to default backend webdav

implement webdav_proppatch webdav

add proppatch op webdav

add proppatch interface webdav

make multistatus response ready for proppatch requests webdav

fix multistatus response and add propfind tests webdav

handle missing properties in multistatus.c webdav

(0) -100 -30 -10 -7 +7 +10 +30 +100 +300 tip

mercurial