txr: @(eof) takes argument for binding termination status.

We extend the matching context structures to keep track of the
underlying stream from which lines are being taken via the lazy list.
Then the implementation of the @(eof) directive, when it hits the eof
condition, can use this stream to gain access to the termination status.

* match.c (match_line_ctx, match_files_ctx): New member, stream.
(ml_all): Take stream argument and initialize new member.
(h_call, do_match_line): Pass stream argument to h_call.
(mf_all, mf_file_data): Take stream argument and initialize new member.
(mf_from_ml): Propagate stream from line context to file context.
(freeform_prepare, v_next_impl, match_filter, match_fun, extract): Pass
stream argument where now needed.
(v_eof): Implement termination status binding via the stream stored
in the context.
(open_data_source): Store stream in match files context.

* tests/010/eof-status.txr: New file.

* tests/010/eof-status.expected: New file.

* Makefile (tst/tests/010/eof-status.ok): -B option for new test.

* txr.1: Documented eof directive, argument and all.

* stdlib/doc-syms.tl: Updated.

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