Implementing local function binding constructs.

* eval.c (fbind_s, lbind_s, flet_s, labels_s): New symbol globals.
(env_fb_to_fb): New static function.
(lookup_mac): Implement the same shadow check for function macros
that is done for symbol macros, because we now have local functions
that can shadow local macros.
(fbindings_helper, op_fbind, make_fun_shadowing_env,
expand_fbind_vars, me_flet_labels): New static functions.
(expand): Add cases for fbind and lbind.
(eval_init): Intern the four new symbols.
Register sys:fbind and sys:lbind operators.
Register flet and labels macros.

* txr.1: Documented flet and labels.

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