Fix finding modification times.

Conflicts:
	kronolith/lib/Api.php
Remove old cruft no longer necessary since switching to SabreDAV.

Conflicts:
	ansel/lib/Api.php
	mnemo/lib/Api.php
Fix exporting contacts without __uid attribute via WebDAV.
Export owner and read-only information via WebDAV.

Conflicts:
	mnemo/lib/Api.php
	turba/lib/Api.php
Export nicer display names for users and resources via WebDAV.

Conflicts:
	mnemo/lib/Api.php
BFN