Issue: CLOS-CONDITIONS (Version 3)

[Gregor.pa@Xerox.COM]

This needs to say a little bit more than that condition types are CLOS
classes.  We already new they were classes since they were types defined
by defstruct.

What we need to know is what the metaclass is.  That is crucial
information because it is what allows people to include classes that
were not defined with define-condition in their condition classes.

BTW, if you want a concise version of my rational for B over A its:

 "The best argument for adding list function specifiers to the
  language was to avoid the problems caused by automaticall
  creating and interning symbols.  That argument must also be
  strong to eliminate automatically generated symbols from
  define-condition."
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