[MERGE] Add Hooks.install_named_hook

[Daniel Mark Watkins]

On Sun, 09 Mar 2008 16:42:40 -0400
Aaron Bentley <aaron at aaronbentley.com> wrote:
> I agree with the rationale.  But this patch introduces code
> duplication. Why not have install_hook call install_named_hook with a
> None name?
Done in attached.

> In this case, you can change it to
> 
>         try:
>             self[hook_name].append(a_callable)
>         except KeyError:
>             raise errors.UnknownHook(self.__class__.__name__,
> hook_name) if name is not None:
>             self.name_hook(a_callable, name)
Done in attached.

All tests pass, but there are a number of new DeprecationWarnings.  I'll
start on fixes for those tomorrow.
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