Newline missing in generated batch script
**Bug description / feature request:** When running struphy with `-b` but not with likwid. The `batch_script.sh` is incorrectly generated. * Newline missing between "# Run command added by Struphy" and "srun ..." * The srun command is now run with `srun -n str(mpi)` which means struphy will be run with the number of cores that are speciefied by `--mpi X` and NOT by the number of cores that are specified in the batch script. This is not how it was set up previously. * Which method is preferred? **Expected behavior:** There should be a newline... **Proposed solution:** I will add an `\n` in console/run.py
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