Radio: Added Ieee80211 specific transmission class.
Radio: Added TODOs.
Radio: If the carrier frequency doesn't match, reception is not possible.
Radio: Renamed C++ namespace to physicallayer.
Radio: Moved all radio subdirectories directly below physicallayer.
Radio: Renamed common to base and generic to common.

Updated NED package names.
Radio: Removed some completed TODOs.
Radio: Added opMode and preambleMode to transmission.
Radio: Replaced std::cout with EV_DEBUG.
Radio: Removed obsolete XML configurations from dimensional tests.
Radio: Implemented interpolating antenna and cleaned up other models.
Fixed NED imports.
Radio: Followed recent renames with oppfeatures.