[bug #60954] [troff] implement environment renaming and/or removal

[Dave]

Follow-up Comment #5, bug #60954 (project groff):

I suppose the overarching question is how much time to devote to a difficult
problem the solution of which serves only to appease a sense of orthogonality
rather than solve a real-world problem.

If you decide to allow deletion of active environments (and I agree that the
simplest solution is to disallow it, as it wouldn't even have helped with the
problem Werner thought he needed to solve back in '06), it shouldn't require
any pointer manipulation upon the delete itself: it's only upon popping back
to the now-nonexistent environment that some evasive action need be taken. 
(There's no requirement that the stack be empty upon program exit, so a user
might delete an active environment knowing full well that they'll never pop
back to it.)

Deleting the _current_ environment raises thornier questions and I presume
would be disallowed in any case.

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