Added RadioBase to avoid duplicating gates, signals, etc.
Moved the current radio implementation into a separate directory.

There will be 3 different kind of radios: ideal, simplified and detailed.
Moved the ideal radio into a separate directory.
Moved the old link layer contract into the common directory.

This isn't really a contract in the sense of being the common interface among different link layer implementations.
Moved the IPv4 contract into a separate directory.

This is rather a contract among different IPv4 implementations.
Moved the IPv6 contract into a separate directory.

This is rather a contract among different IPv6 implementations.
Moved the current network layer contract to common.
Moved the echo protocol to common.
Moved the IEEE 802.11 radio into a separate directory under physical layer.

Renamed Ieee80211RadioModel to SimplifiedIeee80211RadioModel.
Fixed NED names in examples and tests.

Followed renames in the models.
Various IdealRadio changes.

Renamed IdealAirFrame to IdealRadioFrame.
Renamed IdealChannelModel to IdealRadioChannel.
Simplified the implementation.
Various SimplifiedRadio changes.

Adapted to the new radio interface.
Renamed Radio to SimplifiedRadion.
Renamed ChannelControl to SimplifiedRadioChannel.
Renamed propagation directory to attenuation.
Also renamed a number of other classes and models according to the new naming scheme.
Renamed IdealWirelessMac to IdealMac.

Renamed all affacted classes and models.
The implementation didn't contain any wireless specific code.
Various IdealMac changes.

Adapted to the new radio interface using signals.
Various Ieee80211Mac changes.

Adapted to the new radio interface.
Added signal listeners and controlling the radio mode.
Renamed channelControl submodules to radioChannel.
Fixed oppfeatures to reflect recent changes.
Migrated the BMac mac layer from MiXiM to INET.

Adapted the implementation to signals and the interface of the new radio model.
Migrated the Flood network layer from MiXiM to INET.

Adapted the implementation to the interface of the network layer.
Migrated some MiXiM utils to INET.