DP 9 put the save and load functionality into the AddressList and added
the dirty-flag to AbstractAddress
DP 10 implemented the decorator pattern. 

right now there is no need for concrete decorators, working with just
one class is absolutely fine. The important code changes happened in the
refreshAddressList()-method (AddressList) and the DoubleClickListener.

And some minor changes mostly regarding debuggin information or the
output.