* commit '0df33f3f':
  ZP-848 SetSyncKey in SPO always if it is set (as before), but invalidate FolderStat if it does not change.
  ZP-741 Remove folder type from the loop detection data.
  ZP-772 Change default value of USE_FULLEMAIL_FOR_LOGIN to true.
  ZP-622 ZPushAdmin and Sync-without-heartbeat should not load the hierarchy folderdata states.
  ZP-778 Remove unused code.
  ZP-847 Remove fseek from encoder as not all stream types support it. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-622 Devices performing heartbeat weren't handling changes properly.
  ZP-622 Update year.
  ZP-778 Make sure the hierarchy cache is loaded when verifying hierarchy changes in SyncCollections.
  ZP-777 Verify potential hierarchy changes against a hierarchy hash coming from all foldernames + parent ids.
  ZP-622 Update year.
  ZP-771 Indicate changed additional folderdata in DeviceManager->IsHierarchySyncRequired().
  ZP-778 Verify received hierarchy notifications for validity.
  ZP-777 Catch and filter hierarchy events.
  ZP-622 added HIERARCHYNOTIFICATION constant to the IBackend.