Some more support for recursion.
Some more support for recursion.

Recursion is still broken, it does not work for recursive invocations of let constructs.

nathanielbaxter/libminizinc,tias/libminizinc,tias/libminizinc,jjdekker/libminizinc,nathanielbaxter/libminizinc,nathanielbaxter/libminizinc,jjdekker/libminizinc,jjdekker/libminizinc,jjdekker/libminizinc,nathanielbaxter/libminizinc