[MERGE] Fix #296620 by allowing plugins instead of requiring them.

[Robert Collins]

On Tue, 2008-11-11 at 11:16 -0500, Aaron Bentley wrote:
> 
> So I can't see why bzrlib/__init__.py:111 is necessary.  Can you shed
> any light, Robert?

It makes the plugin path available to users of bzrlib that don't want to
load all plugins; so you can import a plugin without loading them all -
and that one can get its dependencies too. It also means you don't have
to call a special magic method to let this work in your code.

-Rob
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