[Vm-dev] Progress changes break VMMaker

[Balázs Kósi]

> Another is to change the superclass of ProgressInitiationException
> from Notification to Exception.
Actually I don't understand why exactly this works. It could be something like
that you can't activate an exception handling block more than once, and now
we activating it only once, but in the original setting it was activated by the
ProgressInitiationException, and it won't trigger for the subsequently
signalled Notifications?

Balázs