Merge: nitcc: add prefixes
authorJean Privat <jean@pryen.org>
Thu, 23 Jun 2016 20:21:48 +0000 (16:21 -0400)
committerJean Privat <jean@pryen.org>
Thu, 23 Jun 2016 20:21:48 +0000 (16:21 -0400)
This add the `Prefixes` operator that returns the set of all prefixes of a regular language.
This also fixes some bugs.

Pull-Request: #2195


Trivial merge