UnusedGlobals

Hi,

Here is a patch which adds a UnusedGlobals namespace, when a variable
binding
is removed from a namespace, it tests if the binding is used by a
compiled method
  (could be changed), if yes the global is added to the UnusedGlobal
namespace
otherwise it's removed. The vm is changed a bit to bootstrap the new
class and
there is a simple test case.

Cheers,
Gwen

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