Add qsub templates

[eurunuela]

Summary

We should add a template for qsub commands that users can edit for the package to work on their clusters.

Additional Detail

qsub commands are not identical for all HPC clusters. We should provide an easy way to make connPFM work on all cluster, and a template that can be fed from Python is a good option.

Next Steps

1. Create a template that takes as many parameters as possible from Python.
2. Create a function that feeds the template.
3. Call this function before every qsub command.
4. Test on the BCBL and DIPC clusters.

[vinferrer]

Looking at this issue now that DIPC has the SLURM queue i don't know if it makes a lot of sense to do this