[IronPython] Referencing extension modules from hosting

[Dino Viehland]

Jeff wrote:
> What about AppDomain.Current.GetAssemblies()? Not sure how that would
> play with a remoted engine, mind you.

Oh, I didn't know about that.  Go ahead and open a bug for this one as well.
As long as there are no bad performance problems from reflecting over every
assembly this would be cool - at least as an option on the ScriptRuntime.  I
could see a desire for us not to always do this because you might want to have
different runtimes w/ different loaded modules in the same app domain.