add keyword formals to functions

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Does this make any sense?

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For functions, this does make sense. In forms like these:

(φ #:k k (add1 k))
(φ* (a #:b b) (+ a b))
(φ* (a #:b [b 0]) (+ a b))

As long as the keyword is not a pattern directive, a keyword in a pattern should always follow a pattern or a pattern+default -value.