C garbage collector.

[Francois-Rene Rideau]

>    I've modified jql's GC, and it looks like the little it does work,
> but we'd need a scheme interpreter to fully test it (any takers?)
> see "http://www.eleves.ens.fr:8080/home/rideau/Tunes/files/rtgc-0.2.tgz".
Oops. That's Tunes/files/misc/rtgc-0.2.tgz.

Note for persistence and OTOP:
we could fork a process which would queue blocking system calls,
so that the main process isn't stopped by things like the above fsync(),
unless it really needs to.

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