Migrating away from plotnik (to Hayes2009?)

[chrisbrickhouse]

Saw that @JoFrhwld starred @kylebgorman's hayes2009 package. I know we'd been talking about plotnik as a blocker for #11 and #12, and this seems like a package that might be a useful replacement. In a comment on 11 Joe laid out the following ideas, and I think hayes2009 might be useful in resolving 1 and 2. Thoughts on how we might handle this migration?

1. Moving translation into plotnik codes out of FAVE-extract, and into a pre-processing procedure on the output of FAVE-align.
2. Replace plotnik contextual coding with simply including segmental and lexical information in the FAVE output.
3. Providing FAVE-extract with a list of vowel phones and measurement point heuristics.
4. Providing FAVE with means and covariances for the specialized phone set.