[packagekit] Removing UpdateSystem()

[Richard Hughes]

Hey all,

I was talking to Daniel last week and we started talking about
removing UpdateSystem() from the API. The basic questions are:

* do we ever want to treat GetUpdates()->UpdatePackages() any
differently to UpdateSystem()
* do we ever now want to do GetUpdates before updating the system?
i.e. "I just don't care, JFDI"

If you've got a valid use case of UpdateSystem -- then please explain.
Otherwise I'll probably remove it from the API this week. Thanks.

Richard.