set y axis lower value with automatic upper value #92
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There is some dependence on other options that are used, but in many cases the lower limit is not 0 when plotting event yields if --ylim is not used explicitly with 0 as first argument, but the annoying part if that this was expecting the user to also specify the upper value.
With this PR one can use --ylim 0 -1 (or any pair where up < low) to set the minimum to 0 (but any value is possible) and the maximum to an automatic value based on the histogram content plus variance (plus an additional 10% of the difference between the automatic maximum and the chosen minimum, which is good to keep to avoid that the histogram touches the top margin).