CASEQ extensions

[GLS at SU-AI (Guy Steele)]

[a] In NIL, CASEQ will presumably be extended to allow
dispatching on characters, as well as fixnums and symbols.
[b] It would be convenient to have a syntax for specifying
ranges for fixnums and characters.  A simple idea would be
to allow something of the form (3 7) or perhaps (RANGE 3 7)
where a single item would be allowed.  The former could
be permitted only within a list; the latter could be permitted
as a single element by making RANGE a reserved word.
(Perhaps &RANGE should be used instead in that event.)

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