S9 LIB  (loutify-char char)      ==>  string
        (loutify-string string)  ==>  string

LOUTIFY-CHAR converts a char to a string that is save for
inclusion in an Lout document. LOUTIFY-STRING does the
same for a string.

(loutify-char #\")        ==>  "\"\\\"\""
(loutify-string "\"x\"")  ==>  "\"\\\"x\\\"\""
