[imp] Imagick temp files written to /tmp by default

[Aria Bamdad]

>Actually, nevermind. This value is only used in places that Horde has  
>control of where the files are written. I.e., temporary files that  
>*horde* creates. It seems that currently the only way to change the  
>place that Imagemagick/Imagick place *their* temporary files is to use  
>env. variables. See: https://bugs.php.net/bug.php?id=66046

Thanks Mike.  Yes, I had seen that link to the bug report before too.  I will try setting the environment variable then.

Aria