add check if pupil sizes are available for all valid datapoints.
EMDAT raises exception if any missing pupilsizes  for valid datapoints were found
fixed typo in output file name
Updated classes Scene and Segments with calculations of pupil dilaiton.
Segment.py
- added pupil rest size adjustments
- refactored code
Scene.py:
- added calculation of pupil sizes based on values calculated in segments
- added mergevalues()
params.py
- added pupil dilation features to the featurelist