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Lab
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* Gracefully handle programs that write garbled output by replacing problematic characters (Jendrik Seipp).
* Add parsing errors to properties file directly instead of writing them to stderr (Jendrik Seipp).
* Remove special treatment of Slurm "memory cg" errors, since they don't seem to occur anymore (Jendrik Seipp).
* Raise an error if a run command calls a global Python interpreter directly, because this would bypass the virtual environment (Jendrik Seipp).
Downward Lab
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* Group rows in unexplained errors table by error message (Jendrik Seipp).