I/O convenience functions get mode-opt argument.

This is motivated by the desired to be able to
specify gzip compression: e.g.

  (file-put-string "file.gz" "abc" "z")

However, it has other uses. For instance with "x",
we can exclusively create a file with content in one
call.

* stdlib/getput.tl (file-get, file-put, file-append,
file-get-string, file-put-string, file-append-string,
file-put-lines, file-append-lines, file-get-buf,
file-put-buf, file-place-buf, file-append-buf, file-get-json,
file-put-json, file-append-json, file-get-jsons,
file-put-jsons, file-append-jsons): New option argument
which combines with the open-file mode.

* txr.1: Documented.

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