Extending syntax to allow for @VAR and @(...) forms inside

nested lists. This is in anticipation of future features.

* lib.c (expr_s): New symbol variable.
(obj_init): expr_s initialized.

* lib.h (expr_s): Declared.

* match.c (dest_bind): Now takes linenum. Tests for the meta-syntax
denoted by the system symbols var_s and expr_s, and throws an
error.
(eval_form): Similar error checks added. Also, hack: do not add
file and line number to an exception which begins with a '('
character; just re-throw it. This suppresses duplicate line
number addition when this throw occurs across some nestings.
(match_files): Updated calls to dest_bind.

* parser.l (yybadtoken): Handle new token kind, METAVAR and METAPAR.
(grammar): Refactoring among patterns: TOK broken into
SYM and NUM, NTOK introduced, unused NUM_END removed.
Rule for @( producing METAPAR in nested state.

* parser.y (METAVAR, METAPAR): New tokens.
(meta_expr): New nonterminal.
(expr): meta_expr and META_VAR productions handled.

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