Add seed generation with python as an example to the SYSTEM command
@kraus wrote a nice usage of the SYSTEM
command in the OPAL mailing list:
the lack of support of SEED=-1 doesn't mean that you have to do this manually. Add SYSTEM, "python gen_seed.py"; to the end and CALL, "gen_seed.opal"; somewhere at the begin of your input file and add the two files in the attachment to the directory where you run this input file.