implement distributed snapshot for wallets and add x-quantile to histogram view

...ucoin/actions/control/ActionSuperVisorCreateSnapshot.java

...va/fucoin/actions/control/ActionWalletCreateSnapshot.java

...fucoin/actions/control/ActionWalletGetSnapshotAnswer.java

...ain/java/fucoin/configurations/AbstractConfiguration.java

src/main/java/fucoin/gui/SuperVisorGuiControlImpl.java

src/main/java/fucoin/gui/SuperVisorHistogramGUI.java

src/main/java/fucoin/gui/SuperVisorThreadGUI.java

src/main/java/fucoin/gui/WalletGuiControlImpl.java

src/main/java/fucoin/wallet/AbstractWallet.java

src/main/java/fucoin/wallet/Snapshot.java

src/main/java/fucoin/wallet/WalletImpl.java