Added CPUS_PER_TASK and a jupyterlab.sbatch

[emarti]

Two changes: First, I added jupyterlab.sbatch so we can use jupyter lab notebooks instead of the modern ones. Second, I added a CPUS_PER_TASK parameter in param.sh so we can change the number of CPUs requested.

[vsoch]

This looks great! Two quick checks:

• the default of --cpus-per-task on the cluster is set to 1 (so essentially adding it doesn't change current workflows)
• you've tested this and are happy with how it works?

[emarti]

1. When the memory specified is large (on our nodes bigger than 16 GB) then slurm automatically assigns more CPUs. This change will fix this.
2. Yes, I have tested it and it works. For the jupyter lab sbatch, jupyterlab must be installed on sherlock. Perhaps further instructions are needed?

[vsoch]

When the memory specified is large (on our nodes bigger than 16 GB) then slurm automatically assigns more CPUs. This change will fix this.

Gotcha. In this case, we don't want to set a default to be 1, because it will break the default behavior. Let's keep the variable unset, and then only add it to the command if it's defined.