Fixing for GNS 430/530

• DME decimal places
  • Without the fix there is always single zero decimal
  • After fix
    • No decimals if >= 100 nm
    • Single decimal if < 100 nm
• Blinking Nearest Airports page by adding working Airport logos from G1000
• Fallback to runway altitude in Waypoint search for Airport altitude
• Fix most runway types seen as "Unknown"