ref #7589 Move long running task to corresponding service
ref #7674 Move aggregation service method to data set service
ref #7674 Add aggregated description to data set
ref #7597 Use LongRunningTaskService for taxon aggregation
smaller changes for longrunning tasks and progress monitor
check in done() in remotingProgressMonitor whether result is already set
fix problems with progress monitor
make moveTaxonnodes a longrunning task
adapt longrunningTasks service for all subtree operations
add new longRunningTasksService for monitored operations