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Adding a progv operator, similar to the Common Lisp one.
* eval.c (progv_s): New symbol variable.
(op_progv): New static function.
(do_expand): Recognize and traverse the progv form.
(rt_progv): New static function: run-time support
for compiled progv.
(eval_init): Initialize progv_s, and register the the
op_progv operator interpreting function.
* stdlib/compilert (compiler compile): Handle progv
operator ...
(compiler comp-progv): ... via this new method.
* tests/019/progv.tl: New file.
* txr.1: Documented.
* stdlib/doc-syms.tl: Updated.
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