EnPT stdout and stderr are not shown in GUI log window.
![image](/uploads/5482c43442d07534c2911f6cb8645657/image.png) We have to revise the [_run_cmd method](https://gitext.gfz-potsdam.de/EnMAP/GFZ_Tools_EnMAP_BOX/enpt_enmapboxapp/blob/master/enpt_enmapboxapp/enpt_enmapboxapp.py#L354) because it only forwards EnPT errors to the log but the progress of the processing is not visible (only printed to the Python console).
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