Adding a tagbody macro to the language.

This is a "disciplined goto" feature of Common Lisp.
This uses a new sys:switch operator, which could
also be used for optimizing case and cond forms.

* eval.c (switch_s): New symbol variable.
(op_switch, expand_list_of_form_lists, expand_switch):
New static functions.
(do_expand): Hook in the expansion of the sys:switch
operator.
(eval_init): Initialize switch_s special variable to
sys:switch symbol. Register sys:switch special op.

* lisplib.c (tagbody_set_entries, tagbody_instantiate): New
static functions.
(lisplib_init): Register autoloading of tagbody module
via new functions.

* share/txr/stdlib/tagbody.tl: New file.

* txr.1: Documented.

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