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DCSim simulator release v0.3

SG-machines-batch benchmark simulator in WRENCH-2.0 with active jobs …

…performing actions supporting streaming jobs

Merge pull request #1 from HerrHorizontal/test/sgbatch

First edition of the SG-machines-batch benchmark simulator. This is based on a private hacky version of WRENCH-1.10. Due to a probable bug in the workflow builder (see issue #7) only the simulation of copy-jobs gives meaningful results.