Can we remove PWFSLSmoke from depends?

[spencerpease]

There might be valid use cases where someone would want to use the PWFSLSmokePlots package without needing the majority of the PWFSLSmoke functionality. It also seems there is some redundancy and potential confusion about working with both of these packages, in that:

library(PWFSLSmoke)
library(PWFSLSmokePlots)

...

is loading PWFSLSmoke twice. Instead, we could instead import PWFSLSmoke and re-export a select subset of necessary functions in PWFSLSmokePlots. This would reduce redundancy in duplicate loading, and prevent cluttering up the namespace if other PWFSLSmoke functions aren't needed.