New listener feature: greedy evaluation feature.

* eval.c (eval_intrinsic_noerr): New function.

* eval.h (eval_intrinsic_noerr): Declared.

* parser.c (listener_greedy_eval_s): New symbol variable.
(repl): Implement greedy evaluation loop, enabled by
the *listener-greedy-eval-p* special.
(parse_init): Intern the *listener-greedy-eval-p* symbol,
storing it in the listener_greedy_eval_s variable.
Register the symbol as a special variable.

* txr.1: Documented *listener-greedy-eval-p* variable
and the greedy evaluation feature that it controls.

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