#46 Lenght of period event is not obvious when zooming out

[Rickard Lindberg]

If you have a period event and zoom out, it will appear as a point event if its actual size would be less than a few pixels.

This is confusing if you want to compare its length with other events.

[roger lindberg]

Similar problem described in #42

[roger lindberg]

Since #42 is closed and period events now can be displayed as small symbol when zooming out, I close this ticket.