ENH: allow ranges to be set on Styler .bar()
When generating in table bar charts using the [Styler `.bar()`](https://github.com/pandas-dev/pandas/blob/master/pandas/io/formats/style.py):

- extreme outliers in a column mask differences in other values;
- comparisons across columns are not supported.

One solution would be to allow the setting of explicit bounds on the range of values used to limit the bar extrema using explicit values rather than `s.min()` and `s.max()`.

Cell values exceeding the range limits could be extending to the cell edge / maximum limit value and then coloured with an "overflow" colour.