[m-rev.] For review: change moose to accept unique parser states

[Michael Day]

> I was waiting for someone to review the change, but in the absence of
> comment I'll go ahead and commit it now.

I might add a question here: would support for the <Prefix> argument allow
multiple parser declarations, for multiple entry points to the same
parser? As it would be quite convenient some times to have that, for
example when there is a grammar and you want to be able to parse either
terms or full expressions, without duplicating the term grammar in a
separate parser module.

Michael

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