make the carddav backend work with android and baikal/sabredav
fix: cache also based on the configured folder
Remove unused function get_all_vcards (z_carddav.php)
ziirish pull request
merge ziirish
Fixes, separating the URL into <url> and <folder> broke a lot of things
Support for server that dont implement the operation SYNC
Merge branch 'sabredav'