karen - 2005-12-02

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might as well fix our naming 'bugs' at the same time.

that is, we use various names for fields in Frozen and for
method calls in Frozen.

we should
* make our names more obscure to reduce risk of clashing
* consider throwing an error when they do clash (user
isn't expected to know about internals of frozen classes, so
shouldn't be using the same names as us)