Big work on network traversal stabilization

res/icons/icons.qrc

src/cutecoin/core/community.py

src/cutecoin/core/net/network.py

src/cutecoin/core/net/node.py

src/cutecoin/core/watching/monitor.py

src/cutecoin/gui/currency_tab.py

src/cutecoin/gui/mainwindow.py

src/cutecoin/gui/network_tab.py

src/cutecoin/models/network.py