[FIX] directives for interpreting shell

[zhao-cy]

Currently in SGE version, would have:

#!/bin/bash
#$ -S /bin/bash

Where 1st line was added automatically by BABS, and 2nd line is from interpreting_shell. This is redundant. Also, not sure what's the #SBATCH version of this for Slurm clusters. Therefore, probably better just:

1. not to automatically generate #!/bin/bash
2. use interpreting_shell to generate #!/bin/bash or #!/bin/bash -l (for Slurm) - based on what users give in interpreting_shell

[zhao-cy]

Question: does container_zip.sh also needs to use this directives? Or does not matter, only participant_job.sh like this would be enough?

[zhao-cy]

TODO:

• [ ] update docs
• [ ] also to test on SGE clusters after changes.