http_dav.c: MKCALENDAR/MKCOL that fails to set properties MUST result in a 207 <multistatus> response
http_dav.c: don't return DAV:sync-token on home-set until we support sync-report on that resource
http_dav: use data: URL scheme for sync-token rather than fake http:// URL
http_rss.c: use data: URL scheme for <id> rather than fake http:// URL
.gitignore: added timezone related generated files
imapd.c, sync_*.c: refactored IMAP XFER to use replication.  sync_server has been removed and sync_client can now speak both IMAP and CSYNC
imapd.c, sync_support.c: added xfer_finalsync() to get exclusive lock on mailboxes and mark them as MOVING in mailboxes.db to prevent lost updates