#14: delete unused files like Wallet.java, move methods of WalletControl.java interface to AbstractWallet.java and drop WalletControl.java

added paper v0.5 will be updated

The statistics server shows that the average amount is changing quite
hard, this will happen because of the missing updated on the offline
wallets.

Out Implementation won't work with the other Members, because we added
some Actions, and also our network doesn't work.