[kronolith] Calendar Perms with Frombackend/tobackend hook

[Chuck Hagenbuch]

Quoting Bill Graham <grahamcw at hurleybulldogs.com>:

> I think the template was not consistently  unhooking the $user when   
> individual users had permissions.
>
> I have attached a pach ( I hope).

The patch calls htmlspecialchars() on $user too many times, but that's  
easily fixable. I'm just not sure what the right thing is here and I'm  
not in a place to wrap my head around it right now. Jan?

-chuck