Why did edgy->feisty install mdadm (I don't have RAID)?

[Derek Broughton]

Adam Funk wrote:

> I don't have any RAID drives, but the upgrade from Edgy to Feisty
> installed mdadm.  (A friend reported the same thing.)
> 
> Anyone know why?  And is there any reason not to remove it?

I didn't think it was possible to have a default edgy without mdadm,
either - at least I stopped fighting it before edgy was officially
released.

There's no reason not to remove it if you don't have RAID - but it will
remove some of the virtual packages that the upgrade folks tell us we need
for the next clean upgrade (but definitely don't need _until_ then).
-- 
derek