Bugfix on SortLink viewhelper  Thanks to https://github.com/Doc2k
Bugfix - Error with lowlevel extension command cleanup:missingrelations.
Bugfix - Fatal Error: Incompatiblilty SymfonyComponentConsoleCommandCommand::execute Thank to wrock

Bugfix in DownloadService
Migration of AfterFolderDeletedEventListener to BeforeFolderDeletedEventListener in order to properly unindex folders and subfolders
Minor bugfixes
