If we receive a signal, we re-register ALL previous signal handlers.

This fixes the case when we pass signal to previously registered
handler, and it needs to transform the signal into different one.

Still problematic: What if the signal handler we replaced does not
terminate the application? We can end up in a weird state and loop
forever.

Possible solution: Deregister our signal handlers, CALL the previous
signal handler explicitly and if control returns, abort. This would
however complicate our code quite a bit, as we would have to parse the
sigaction we delegate to, decide whether to use signal handler or signal
action, etc...

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