statistics: consider overhang of horizontal axes

The old code didn't consider that labels can peak out of
horizontal axes if labels are under ticks.

This commit takes this into account. However, it must be
noted that this is only heuristics: Before setting the
size of the axes, the actual minimum and maximum label are
not known, because we round to "nice" numbers. But the
size of the axis can only be set after knowing the overhang,
leading to a circular dependency. Therefore, the code
currently simply uses the minimum and maximum value of
the data, hoping that the "nice" values will not format
to something significantly larger. We could do a multi-pass
scheme, but let's not for now.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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