Applications: Renamed common subdirectory to base.

Moved I* module interfaces to contract.
Networklayer: Print routing tables

Signed-off-by: Florian Meier <florian.meier@koalo.de>
ResultFilter for source address

Signed-off-by: Florian Meier <florian.meier@koalo.de>
Group count result recorder

Counts the occurrences of signals with the same attribute.
Can for example be used to count the number of packets received per source.

Signed-off-by: Florian Meier <florian.meier@koalo.de>