Created DavKeyStore and DavKeyCollection for better organization of code related to the special case '/key-collection' CalDAV collection. Improved sync logic for KeySyncWorker. Created a new webdav property 'X-FLOCK-COLLECTION' to be set on all Flock managed WebDAV collections. Modified the 'My calendars' and 'My addressbooks' UIs to only allow editing of WebDAV collections managed by Flock.
fixed bug where status header view would incorrectly claim that Flock was syncing if system-wide sync was disable upon first install.