[horde] Upgrading from 3 to 4

[Chris]

Quoting Jan Schneider <jan at horde.org>:

> That won't work. Like the upgrading docs say, you should make a fresh
> install if upgrading from Horde 3. This includes to *not* install into
> the same directory.
>
> It might also help if you migrate away from datatree *before*
> upgrading to Horde 4, though it should theoretically work in the
> opposite order too.

Hey Jan, thank you for that.  That certainly was the obstacle.   
However, I have to say, I read and re-read the docs over several  
times, I didn't see that written anywhere.  I see the line that says:  
"You can't use the updated data with your old Horde version anymore.",  
but that does not mean "make sure you install your horde update in a  
fresh directory" (at least it didn't to me, unless I'm missing it  
somewhere else).  I just wonder if a quick line in the install or  
quick install section might make this clearer, such as "mv  
/var/www/horde /var/www/oldhorde" and then commence with the  
instruction.  Of course, that is just my two cents, but it might  
reduce a few cries for help in the future.

Thanks again, I'm up and running now.

-Chris