[packagekit] Adding support for "prepare" in transaction_flags

[Matthias Klumpp]

According to Richard, the problem here is that we would also
completely break all frontend APIs - if you use PkTask right now,
nothing's changed.
I think it would be worth to do it, but I'm not sure what Richard has to say ^^
(We discussed this a few hours ago on IRC, and Daniel (glatzor) also
commented on it and how they do it in aptdaemon)

2012/6/3 Daniel Nicoletti <dantti12 at gmail.com>:
> 2012/6/3 Matthias Klumpp <matthias at tenstral.net>:
>> I really liked the suggestion for all stuff like RemovePackages()
>> InstallPackages() etc. to just enqueue the actions and one new
>> "Commit()" signal to really apply the changes.
>> This would solve the issues, but to implement it properly, backend and
>> frontend APIs would have to be broken, which is not ideal.
> Well right now pretty much everything is broken, even the
> install/remove/update methods, so creating this method would
> imo bring some goodies, I can only tell by apt, but maybe
> other backends could make use of that too.
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