[dev] category_order addition to Horde_Category

[Chuck Hagenbuch]

Quoting Marko <marko@oblo.com>:

> this is my attempt to have a category_order field added to the
> horde_categories table and subsequently integrated to provide user defined 
> ordering.

This is committed now, thanks. I haven't tested the ordering code itself,
but it doesn't seem to cause any problems with existing functionality.

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"People ask me all the time what it will be like living without otters."
 - Google, thanks to Harpers