[MERGE] Add documentation for hooks

[Aaron Bentley]

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Ian Clatworthy wrote:
> Aaron Bentley wrote:
>> Hi all,
>>
>> This patch adds some documentation on hooks.  I needed to find out more
>> about hooks, and I couldn't find any documentation, so I wrote some.
> 
> bb: comment
> 
> I'd rather this was part of the Reference Manual instead of the User
> Guide.

To me, it seems like the same kind of document as plugins.txt, which is
why I put it there.

Aaron
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