ochre-lang

Copperbox revision 3189.

I've fixed mistakes in the ExpandMain and InlineSuper modules, stopping them re-initialize the fresh variable counter. This was re-generating already used names in an expression. Also I've improved let-linearization which was stopping demo 4 (which uses super calls) working.

That said, I'm not entirely convinced I'm inlining super calls correctly - I have a feeling they should be inlining in concert with inheritance flattening.