[dev] New Wiki diff funcionality.

[Chuck Hagenbuch]

Quoting eculp at encontacto.net:

> I then went back and tried to make another change to have a third
> version to play with and when I tried to save it, I got
>
>   History page not found
>   Page Saved

Please update again - a lot of code changed today - and the make 
absolutely sure
that your SQL tables match what is currently in wicked.sql. If after that you
can still reproduce any of this, let the list know, along with which database
you're using and any errors that appear in horde.log or your database log.
Thanks,

-chuck

--
"Regard my poor demoralized mule!" - Juan Valdez