To-do file
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The ideas Graham had (in README).

Allow tar files on pipes (i.e. unseekable files), so that the files
can be stored compressed to save disk space. (May also want to allow
invocation of gzip with popen() or similar to make playing compressed
tar files easier.)

Make csf2tar better, and document it.

fix 'retriggered note at end of pattern' problem.

make it output half-a-second or so of silence after an exit when it
was in last_line+1.
