verifyRankHist: RAnEnExtra::verifyRankHist
In Weiming-Hu/RAnEnExtra: Extra functions for RAnEn

RAnEnExtra::verifyRankHist calculates the rank histogram.

1	verifyRankHist(anen.ver, obs.ver, show.progress = F, pre.sort = F)

`anen.ver`	A 4-dimensional array. This array is usually created from the `value` column of the `analogs` member in the results of `RAnEn::generateAnalogs`. The dimensions should be `[stations, times, lead times, members]`.
`obs.ver`	A 3-dimensional array. The dimensions should be `[stations, times, lead times]`. You can generate the array using `RAnEn::alignObservations`.
`show.progress`	Whether to plot a progress bar.
`pre.sort`	If your anen.ver members are already sorted, you can save ~ 80% of execution time. To pre-sort your members, use this line `anen.ver = aperm(apply(anen.ver, 1:3, sort, na.last = T), c(2, 3, 4, 1))`.