[Help-smalltalk] new GTK event loop, part 2

[Paolo Bonzini]

These are the changes needed to make the debugger work with the new GTK 
event loop.  Gwen confirmed that Iliad works under VisualGST with the 
first patch I posted, but the debugger was broken (he also had hacks in 
his patch to fix this).

In the old event loop, the debugger worked more or less by chance 
because it went into a busy wait processing GTK events.  Now instead we 
must return from whatever GTK event we were processing (returning nil 
seems to work) so that g_main_context_dispatch can keep running.  Doing 
this requires implementing a nice CallinProcess>>#detach method that 
changes the CallinProcess into a Process and continues the work there.

In the meanwhile, I fixed a few bugs in UnhandledException that popped 
up while testing.  We are very very close to removing the old 
instance-based (VisualAge-inspired) exception handling system.

All that's missing is GtkDialog>>#run, then we're good to go.  Gwen, 
would you take a look at that?

Paolo

event-loop-p2.patch
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