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Orbital autopilot (no map)

A very simple station-keeping script which very occasionally fires thrusters to maintain ship's orbit with desired height and shape.

Configuration
The script is configured in Programmable block's Custom Data, with all parameters located in [OrbitAutopilot] section:

• MinAltitude - minimum safe orbit altitude above planet highest surface level (HSL) in km. The default is 10 km,
  
• MaxAltitude - maximum safe orbit altitude above HSL in km. The default is ApoapsisAltitude + AltitudeRange + 10 km,
  
• PeriapsisAltitude - desired periapsis altitude above HSL in km. Required for script to function; cannot be lower than MinAltitude + AltitudeRange,
  
• ApoapsisAltitude - desired apoapsis altitude above HSL in km. If omitted, equals to PeriapsisAltitude,
  
• AltitudeRange - tells how much periapsis and/or apoapsis altitudes can deviate from desired before script will consider to correct them. The default and minimum permitted value is 1 km,
  
• TargetInclination - desired inclination in degrees. If empty, the script will not change orbital plane,
  
• TargetLAN - desired longitude of ascending node in degrees. If empty, the script will not change orbital plane,
  
• InclinationRange - tells by how many degrees the current orbital plane can deviate from desired, with 1 degree being the default,
  
• TargetAoP - desired argument of periapsis in degrees. If not specified or if desired orbit is circular, the script will not rotate the orbit ellipse in its plane,
  
• AoPRange - maxium deviation of AoP in degrees, by default 1.