[patch] asynchronous callouts

[Joe Shaw]

Hi,

I just committed the attached patch, which makes the callouts
asynchronous, but still executed one at a time.  This means that the
daemon will be responsive now in callouts, and trying to use libhal or
one of the utility functions from a callout won't deadlock things. :)

A good TODO item would be to have callouts time out after a while, say
20 seconds.  Another might be to spawn multiple callouts at once, with
an upper bound of 2, 3, 5 or something.

Joe
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