add webdav_plist_iterator_remove_current tests and fix some plist related bugs webdav

add plist iterator webdav

add tests for webdav_propfind_init and fix wrong backend call webdav

move backend initialization to new function webdav

refactore webdav backend struct webdav

add propfind/proppatch parser and first iteration of the new webdav api webdav

(0) -100 -30 -10 -6 +6 +10 +30 +100 +300 tip

mercurial