#155 the RefreshDocumentWorker is not executed in the EDT anymore and a busy label is shown while it is executed.
#155 execute the PictureReaderWorker properly and show a busy label while it is running
#155 renamed pnlBusyLabel and showBusyLabel()
#155 execute the PictureSelectWorker properly and disable the JList lstPages while the worker is running.
#155 changed the moment of enabling and disabling of the busy label
Merge branch 'bug/155-gui-freezes-in-VermessungRissEditor' into dev
#154 make use of BackgroundTaskMultipleDownload in VermessungRissAggregationRenderer
Merge branch 'feature/154-BackgroundTaskMultipleDownload-in-VermessungRissAggregationRenderer' into dev