[plt-scheme] a little more keyword-argument support

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Tue Apr 22 14:00:21 EDT 2008

In SVN, the `class', `send', etc. forms now support methods with
keyword arguments.

The `apply' function now accepts arbitrary keyword argument, and it
passes them on to its argument function. Similarly, `keyword-apply'
accepts direct keyword arguments to be merged into the supplied lists
of keys and values.

For fine-grained control over keyword procedures, a new
`procedure-reduce-keyword-arity' function supports refining the set of
keywords that are accepted/required by a procedure --- especially one
created by `make-keyword-procedure'.


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