Calculates log return period given a return value of interest, using model fit from `extRemes::fevd`

. Standard error is obtained via the delta method. The return period is the average number of blocks expected to occur before the return value is exceeded and is equal to the inverse of the probability of exceeding the return value in a single block. For non-stationary models (those that include covariates for the location, scale, and/or shape parameters, log return periods and standard errors are returned for as many sets of covariates as provided.

1 | ```
calc_logReturnPeriod_fevd(fit, returnValue, covariates = NULL)
``` |

`fit` |
fitted object from extRemes |

`returnValue` |
value for which return period is desired |

`covariates` |
matrix of covariate values, each row a set of covariates for which the log return period is desired |

Results are calculated (and returned) on log scale as delta-method based standard errors are more accurate for the log period. Confidence intervals on the return period scale should be calculated by calculating a confidence interval for the log return period and exponentiating the endpoints of the interval.

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