[Yhc] Warning, API change in Yhc.Core.FreeVar

[Neil Mitchell]

Hi,

I have developed the API using the word Free to mean both Free and
Bound. This is not good. As a result I'm going to be changing most of
the terminology in the library, and pretty much guarantee to break all
the people using this API.

I don't think thats many people, in fact it may well just be me, but
before breaking API's I thought I'd let everyone know. The patches
should be coming along in about half an hour.

Thanks

Neil