Fix some bugs with accidents animation

[MichaelPolla]

• If a unique day is set (e.g. 01.01.2016 - 01.01.2016), no points are shown and the time isn't updated in the timeline.
• At the end of the map animation, the last point is animated multiple times during a certain time. It's more visible if the selected period is short :

[maximeburri]

Second point fixed.
First point is a problem beacause the user doesn't specify time, so the range is between is from 01.01.2016 00:00:00 to 01.01.2016 00:00:00. The best way is to add 24 hours to the second datetime.