Environment: Renamed cache directory to objectcache.
Mobility: Renamed common subdirectory to base.
NetworkConfigurator: Fix two bugs in errorRate computation

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

Signed-off-by: Florian Meier <florian.meier@koalo.de>
Ieee802154: Correct physical layer settings

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

Like StaticGridMobility, but with concentric circles

Signed-off-by: Florian Meier <florian.meier@koalo.de>
Mobility: Fixed import after subdirectory rename.