FIX #1177, partially at least.
Now we don't wait for outstanding IO requests when shutting down at program exit time, but we still wait when shutting down a DLL (via hs_exit()). There ought to be a better way to do this, but terminating the threads forcibly is not a good idea (it never is: the thread might be holding a mutex when it dies, for example). I plan to add some docs to the user guide to describe how to shut down a DLL properly.
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