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   Obtain the linear model of an airship at a particular flight condition.
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   Form:
   [g,gLat,gLon] = GetAirshipLinMod( name, h, V, theta )
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   Inputs
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   name        (:)      Name of linear model mat-file. 
                          (see "GenerateAirshipLinMods.m")
   h           (1)      Altitude                          [m]
   V           (1)      Total velocity                    [m/s]
   theta       (1)      Pitch                             [rad]

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   Outputs
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   g           (.)      Full state linear model, statespace class
     
           Additional outputs optinal: (see "AirshipStatespace.m")

   gLat        (.)      Lateral-Directional linear model
   gLon        (.)      Longitudinal linear model

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