Thoughts on controls

[abigailkeller]

Just noting a few things that we should make sure is in the documentation about user-specified controls:

1. If the user wants verbose output, they should specify this by control <- list(verbose = TRUE).
2. If constants are needed in the discrepancy function, they should provide this by: control <- list(disc = list(n = n)).

And then a few questions:

1. Right now controls used in the simulate data function are in control$disc. Does this make sense?
2. What is the intention for control$draw?