Required spec changes for D-Bus 1.0

[Havoc Pennington]

Thiago Macieira wrote:
> 5) clarify the use of Sender and Destination message headers when used in 
> peer-to-peer mode. Probably set to empty on sending and ignore on 
> receive.

I'd say they should just not be used in peer-to-peer. Sender is set by 
the bus daemon anyway so libdbus never sets it, and destination can 
usually be NULL in the DBusMessage API I believe.

The normal rule is that unknown fields are ignored by recipients, so if 
someone does set them it's not an error though, just useless.

Havoc