Feature Complete

Finalised the proof output and goals.
The Local Function definition now producces a Function f with the right
domain and range, together with the rules presented in cases.
Then proof goal of this local definition is set to
for all x we have x is element of dom(f) if and only if x is in exactly one of the subdomains.
This suffices as welldefindness check on f, besides the right range.

Further checks that should be implemented are the correct range of the function.
And optional subproof such that the presented goal can be check easily.

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