Add print of various statistics in map window

Related to #392, #435

First investigate what is possible:

- Visually, can we add an info box with various stats somewhere in the map window?
- What can we calculate? One interesting statistic is the "first date that co2 / property appears inside the hazardeous area" (and maybe same for "outside the containment area"). Need to be careful when calculating and printing statistics for multiple realizations, since some realizations might never reach the hazardeous area.
- How will this look when we have regions instead of polygons?