[issue1272] Decode __file__ and co_filename to unicode using fs default

[Guido van Rossum]

Guido van Rossum added the comment:

> > Oh. Hm. I still wish that PyCode_New() could just insist that the
> > filename argument is a PyUnicode instance. Why can't it? Perhaps the
> > caller should be fixed instead?

> I'll try.

I figured out the problem -- it came from marshalled old code objects. 
If you throw away all .pyc files the problem goes away.  You can also
get rid of the similar checks for the 'name' argument -- this should
just be a PyUnicode too.  A systematic approach to invalidating all the
.pyc files is updating the magic number in import.c.

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