compare to "slurmR" package

[reblake]

https://github.com/USCbiostats/slurmR
https://www.theoj.org/joss-papers/joss.01493/10.21105.joss.01493.pdf

[qdread]

The new features under development should mean that rslurm can now have a "yes" for whether it has functions corresponding to the "apply" family, since we already have one that corresponds to mapply and will be adding one that corresponds to lapply.

The next thing to do would be to add support for restarting parts of a job, if only some cores returned errors, which is partially addressed in #38 but which we need to work on fleshing out. That would address the "Rerun" column of their table.