symbol::token.

symbol::token.

This is allows the user to get the type of a token return by
yylex.

	* data/lalr1.cc (symbol::token): New.
	(yytoknum_): Define when %define lex_symbol, independently of
	%debug.
	(yytoken_number_): Move into...
	(symbol::token): here, since that's the only use.
	The other one is YYPRINT which was not officially supported
	by lalr1.cc, and anyway it did not work since YYPRINT uses this
	array under a different name (yytoknum).