Analytic gradient of objective function of Zhang et al. 2003

Uses xranges from limSolve to find deterministically-known OD flows

1 | ```
getActive(y, A)
``` |

`y` |
numeric vector of link loads, dimension m |

`A` |
routing matrix of dimension m x k |

logical vector of length k; TRUE for unknown OD flows, FALSE for known

1 2 |

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