no more IdImpl in playground.benjamin.*
no more IdImpl in playground.droeder.*
no more IdImpl in playground.acmarmol.*
no more IdImpl in playground.dressler.* (missed one file last time)
no more IdImpl in playground.dhosse.*
node swaping reactivated in ca sim
added bidirectional flow test
More detailed scenario analysis...
minor changes + reworked test cases for ca sim
Spatial cutting strategy for any center...