Anders Gidenstam  (anders(at)gidenstam.org)
  - Dual control Nasal modules
  - Configuration of dual-command 3d instruments.

DualControl borrows content from the following authors' contributions
to FlightGear:

Syd Adams - from Aircraft/Instruments-3d/
  - KY-196 Comm Radio.
  - VHF 22 Comm Radio.
  - VIR 32 Nav Radio.
  - KI-206 VOR Gauge.
  - KR-97 ADF Radio.
  - KI-227 ADF Gauge.

Torsten Dreyer - from Aircraft/SenceaII/Instruments-3d/
  - KX-165 Nav Comm Radio.
  - KR-87 ADF Radio.

Ron Jensen - from Aircraft/Instruments-3d
  - KAP140 Autopilot 3d.

