Modified theme for PNG export. Fixed scales on time series plots. Added "started bicycle subtrips per hour". Added "length of started bicycle subtrips per hour". Added "average length of started subtrips per hour". Added "average length of started subtrips per hour and grouped transportation mode". Added "average length of started bicycle subtrips per hour".
Fixed wrong labels. Removed debug code.
Changed plot title font size.
Added "number of bicycle subtrips by age and gender". Modified age group labels (EN). Modified theme template.