fix daylightsavingtimes bug:
> set timedelta to hours not days

ecotrack support:
> 4 sensors per unit > merge on unit and habitat and time!
> sensors log time once every 5 minutes. find closes trackdetection

> calcHabitat() to determine what habitat depending on x,y and PROJ var
> initTempData() get temp data and store in list of list of tuples
-> tempData[unit][habitat] returns (time,temp)
> mergeTemp