* Rename secret_key
* More work to convert to using PTLC
* Updated most code for PTLC
* More work to use ptlc with secret key
* Got itest passing
* Remove unused import
* Use version 0.5.0 of squeaklib
* Added simple unit test for squeak controller
* Use modular addition subtraction for secret key nonce tweak
* Move util to core folder
* Store secret key as hex in database
* Store nonce as hex in db
