first cut of hal service description file

[Havoc Pennington]

On Thu, 2005-03-31 at 23:42 -0500, David Zeuthen wrote:
> 
> So, you don't you consider it ABI breakage if the application HAL
> removes / adds exceptions in a supposedly stable ABI? I surely do.

I think it's defined by the interface whether this is in the ABI
contract. The whole point here is, we should not put this in the ABI
contract for dbus interfaces.

Havoc