funcallable-standard-class

[Gregor.pa@Xerox.COM]

Another note just to record something we all need to think about.

We need to document the metaclass which generic-function classes use.
This is so that people can define their own generic-function classes
(the need to know what :metaclass to specify).

Also, the funcallable-instance functionality is useful enough, and easy
enough to document that I think we should make it generally available.

This note will serve to remind me to mail out a proposal about this
based on what is now in PCL.