[MERGE] Add Hooks.install_named_hook

[Aaron Bentley]

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Daniel Mark Watkins wrote:
> On Wed, 02 Apr 2008 09:32:05 +0300
> Alexander Belchenko <bialix at ukr.net> wrote:
>> Your patch does not pass tests. Please rework it and update it for
>> 1.4 release.
> Done.

bb:tweak

This looks fine, except the deprecations use 1.5 symbols.  I also wonder
whether we should deprecate name_hook now?

Aaron

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