Calculates the weights from two vectors of minimum and maximum dating for each object. Returns a dataframe with the weight in the first column and FALSE in the second if two rows have the same value in both min and max dating. See [publication](https://doi.org/10.1017/aap.2021.8) for information about how this is calculated.
Arguments
- DAT_min
a numeric vector containing the minimum date of each object
- DAT_max
a numeric vector containing the maximum date of each object
- verbose
TRUE / FALSE: Should the function issue additional messages pointing to possible inconsistencies and notify of methods?