Update: Zope2 packaging

[Jonas Meurer]

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Hey again,

Good news first: I finally was able to fix the issue where fetch.py
installed the wrong dependencies into the zope2.12 tarball. Thanks to
Michael for help with that.

Now the bad news: A new issue followed immediately. The symptoms are,
that no zope.app.* modules are found when imported, except one:
zope.app.appsetup.

I already digged into this issue, and found out that it has to do with
some kind of namespace collision. All the zope.app.* eggs contain
subfolders zope/app/.... It seems like the first one in PYTHONPATH
occupies the namespace zope.app.

An example:

- - Create two folders with modules: 'module1/zope/app/mod1' and
'module2/zope/app/mod2'.
- - Now add both paths 'module1' and 'module2' to the python PATH either
by listing them in PYTHONPATH environment variable, or by using
site.addsitedir().
- - Now try to import both modules: 'import zope.app.mod1' and 'import
zope.app.mod2'. The former works while the latter doesn't.

- - If you copy mod1 and mod2 both in the same subfolder
'module1/zope/app' instead, both can be imported.

I'm not sure where the error comes from, but this behaviour is broken.
With python eggs, it's not an option to copy all zope.app.* modules into
one single zope/app/ folder.

Maybe someone has an idea what's up here?

Greetings,
 jonas

PS: I also tried Michaels old python wrapper (written in python): it has
the same issues. Thus it's not related to the new python wrapper.
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