Improvements to exercise charts
Improvements to exercise charts

The top margin was decreased and the y-axes now doesn't start at 0 but at the
minimum value (weight) in the series. For some reason the 'min_y_from_data'
option which is supposed to do this doesn't work.

wger-project/wger,rolandgeider/wger,kjagoo/wger_stark,DeveloperMal/wger,petervanderdoes/wger,kjagoo/wger_stark,kjagoo/wger_stark,wger-project/wger,rolandgeider/wger,DeveloperMal/wger,wger-project/wger,rolandgeider/wger,rolandgeider/wger,wger-project/wger,kjagoo/wger_stark,petervanderdoes/wger,DeveloperMal/wger,petervanderdoes/wger,DeveloperMal/wger,petervanderdoes/wger