* BActivationTransaction:
- Remove non-trivial constructor.
- Remove package list parameters from SetTo().
- Add AddPackageTo{Dea,A}ctivate().
* BDaemonClient:
- Add CreateTransaction(). It creates a transaction directory and
initializes a BActivationTransaction. Packages to de-/activate have
to be added afterwards.
- Add BCommitTransactionResult::FullErrorMessage().