Series.isbetween(min,max) method
There is currently a `Series.isin(list)` for checking containment by descrete values. I suggest that a similar method called `isbetween(min,max)` be introduced that checks for if the series value is between `min` and `max`. The method should return exactly the same result  as `(Series >= min) & (Series < max)` but is likely faster as each series element is only visited once. An optional flag can be used for choosing whether `max` should be considered absolutely less than or less than equal to. The method should support the overloading of the comparison operators, so that it e.g. possible to use this for both a floating series, and a time series.
