implement reference counting for DavContext and DavSession dav-2

add dav_move test dav-2

add test_dav_create_collection_webdav dav-2

add test_dav_copy_webdav dav-2

add test_dav_delete_webdav dav-2

add test_dav_store_properties_webdav dav-2

add test_dav_load_content_webdav dav-2

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

mercurial