Parse S-Expressions, yielding STerms and SLists
S expression - either a string or a list of s expressions.
showSxp : Sxp -> String
print an s-expression for debug
sTerm : Parser Sxp
parse an individual s-expression term (not a list).
sList : Parser Sxp
a list is a series of space separated terms surrounded by parens.
sSxp : Parser Sxp
parse an s-expression - either a term or a list.
sSxps : Parser (List Sxp)
parse a series of whitespace separated terms.