Added creation of overlay network based on gephi graph library

pom.xml

...va/fucoin/actions/control/ActionAddOverlayNeighbours.java

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

...main/java/fucoin/configurations/DefaultConfiguration.java

src/main/java/fucoin/configurations/GephiConfiguration.java

src/main/java/fucoin/gui/gephi/GraphWindow.java

src/main/java/fucoin/gui/gephi/ItemBuilderTemplate.java

src/main/java/fucoin/gui/gephi/LabelItem.java

src/main/java/fucoin/gui/gephi/MouseListenerTemplate.java

src/main/java/fucoin/gui/gephi/PreviewSketch.java

src/main/java/fucoin/gui/gephi/RendererTemplate.java

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

src/main/resources/topology.gexf

src/main/resources/topology2.gexf