Coerce (Symbols)

[ELIOT%umass-cs.csnet@CSNET-RELAY.ARPA]

Coercing symbols to strings is fine, as long as NIL is treated as
the empty SEQUENCE, rather than as a symbol.

I have also wanted to have an :initial-contents argument to make-string
and make-sequence, analogous to make-array.  (Make-list should also
have an :initial-contents arg.)