Moved example
Added source object to IPv4Route
Added INetworkProtocolControlInfo.
Added operator<<.
DYMO: multiple changes allowing to use DYMO with arbitrary netwokr protocols

Added flags to handle optional packet content. Use them as needed.
Added handling client addresses parameter.
Added handling interfaces parameter.
Added hangling target sequence numbers.
Replaced IPv4ControlInfo with INetworkProtocolControlInfo.
Packet length is properly computed now.
Fixed bug related to routes to self.