Parse error handling improvements.

* parser.l (prepared_error_message): New static variable.
(yyerror): Emit and clear prepared error message.
(yyerrprepf): New static function.
(yybadtoken): Function moved into parser.y.
(grammar): For irrecoverable lexical errors, stash error message
with yyerrprepf and return the special error token ERRTOK to generate a
syntax error. I could find no other interface to the parser to make it
cleanly exit.

* parser.y (ERRTOK): New terminal symbol, does not appear anywhere
in the grammar.
(spec): Bail after 8 errors, recover to nearest newline, and
use yyerrok to clear error situation.
(YYEOF): Provided by Bison, conditionally defined for other yacc-s.
(yybadtoken): Function moved from parser.l.  Checks for the next
token being YYEMPTY or YYEOF, and also handles ERRTOK.

* stream.c (vformat_to_string): New function.
(format): If stream is nil, format to string and return it.

* stream.h (vformat_to_string): Declared.

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