* Upd signatures in beam to prepare for sbd stuff.
* Upd to tracking sbd explicitly.
* Upd sbd oracle and transition
* Upd parser for explicit sbd. Add hooks for new sbd features.
Merge branch 'feature/experiments' of https://github.com/syllog1sm/redshift into feature/experiments
* Clean comment from eval script
* Fix sbd dynamic oracle. May still be bugs.