* eval.c (rest_s, op_s): New variables.

(do_eval_args): Allow calls specified by improper lists
like (x y . z) where the z expression must evaluate to a list
that turns into addition arguments to be applied.
(transform_op, expand_op): New static functions.
(expand): Call expand_op.
(eval_init): Initialize rest_s and op_s. Use rest_s
to register rest function.

* lib.c (gensym): New function based on gensymv.
(gensymv): Now calls gensym.

* lib.h (gensym): Declared.

* parser.l: Parse @ followed by digits as a new kind of token,
METANUM.

* parser.y (METANUM): New token.
(meta_expr, exprs): Missing rlcp's added.
(expr): METANUM variant introduced.
(yybadtoken): Handle METANUM.

* txr.1: Documented one-symbol argument list of lambda.
Documented op. Closed some unbalanced parentheses.

* txr.vim: Highlight op.

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