indirect estimator (generalized weight share method / gwsm)

compute standard errors for scale-up estimates based on the Killworth estimator

1 2 | ```
killworth.se(estimates, d.hat, total.popn.size = NULL, total = TRUE,
missing = "ignore")
``` |

`estimates` |
TODO |

`d.hat` |
TODO |

`total.popn.size` |
TODO |

`total` |
TODO |

`missing` |
TODO |

note that this is provided for comparison, but that we do not generally recommend using this strategy for estimating variance

the estimated standard error

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