[klutz]Patch to allow caching of Klutz images

[Marcus I. Ryan]

First of all, please keep comics submissions seperate from patches to
the code.  However, the comic has been added.

I've added code that should hopefully do what you want.  I didn't really
see a reason to update lib/Horde.php or use anything besides selfUrl. 
Unless you can give me a better reason, I plan to leave it as is.

Test it out and see how it works.

Quoting Jon Knepher <jbk@wild-e.com>:

> 
> My users like the comics so much, they should cache the images!
> 
> I don't know if adding a parameter to Horde::selfURL() is better than
> using
> Horde::url($_SERVER['PHP_SELF']).  I think adding the parameter is
> better,
> hoping for more cachable pages later...  Should the option for
> caching the
> images be a config option?  I have it hard-coded to always send it as
> cachable.
> 
> If you think otherwise, I'll rewrite the patch to fit the horde
> opinion. :)
> 
> Thanks
> Jon
> 


-- 
Marcus I. Ryan, marcus@riboflavin.net
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