[dev] Group :: hooks

[Chuck Hagenbuch]

Quoting Joel Vandal <jvandal at infoteck.qc.ca>:

> I have rewrite the Group/hooks.php that allow to use dynamic groups 
> and solve the problem of having an hook for each group. You will find 
> a patch for Group/hooks.php (originally writted by Jason Rust) and 2 
> hooks samples.
>
> It can replace the current hooks.php file, or be include as a new 
> Group driver (ex. dynhooks.php)

This looks fine to me at a glance, but I need to leave it to one of the
developers who uses group hooks...

-chuck

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