DTNExampleApp: Send ping (Activity) using an intent instead of a method call
ibrdtn: Add method to the Dictionary to add all EID of a bundle

With this method we can avoid code duplication in the DefaultSerializer.
daemon: Fix queue method of the UDP convergence layer

Previously it was not possible to calculate the bundle length. Thus, the queue
process was aborted on each queuing. This behavior is now fixed.
daemon: Fixing calculation of the payload offset during reactive fragmentation
daemon: Only add default TCP connection if the received discovery message is a short beacon
daemon: Option "net_xx_discovery" and other dead code removed