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   Function called by FZero to solve for tauTL. Only y is used by FZero.
   The other outputs are used after tauTL is found.
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   Form:
   [y, m6, m16, piF, tauF, piCH, tauCH] = FMixedExhaustTurbofan( tauTL,
   alpha, tauLambda, tT4, p, d, gamma6, gamma16, alphaP, r16, r6, tol )
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   ------
   Inputs
   ------
   See JetEnginePerformance

   -------
   Outputs
   -------
   See JetEnginePerformance

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