Unrelated issue re: special declarations

[Glenn S. Burke <GSB @ MIT-MC>]

I'm too burned out now to recreate any arguments, but as i remember
it even with blintz vectors i was perfectly pleased to eliminate
the unspecial declaration, and doing so was one of the first ways
i changed the nil interpreter to be common-lisp compatible wrt declarations.

I've got the implementation details of this, including explanation
of exactly the simplifications i could make by eliminating unspecial,
written down somewhere and will dig them up if necessary.