txr: close streams.

* match.c (noclose_k): New keyword variable.
(v_next_keys, v_output_keys): New static variables.
(v_next_impl): Use v_next_keys in calculating alist,
rather than freshly allocating it each time.
Check for the new :noclose keyword; if it is missing,
close any locally opened stream when done.
(v_output): Refer to v_output_keys precalculated
list rather than allocating it every time.
(match_files): If a stream is opened in by a call
to open_data_source from this function, then
the stream is closed when this function returns.
(syms_init): Intern the :noclose symbol.
(plist_keys_init): New function.
(match_init): Call plist_keys_init.

* txr.1: Documented new :noclose option of @(next).

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