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I've fixed bug #1029475, so reload() will now actually
invoke the PEP 302 loader mechanism.  

However, there's another bug in zipimport: the loader
implementation in zipimport.c always creates a new module,
even when reloading.  It needs to check sys.modules first,
and reuse the existing module if present.  I'm attempting to
fix that issue now, and once I'm done, someone more familiar
with zipimport's cache mechanism can do the rest.