Multiple time series for one group do not show on Ecosim group plots

[sheilah]

When multiple time series of the same type are available for a group, only the first time series is drawn in Ecosim group plots. We'd like to see all of them

[jeroens]

A stupid little issue in the UI coloured the other time series white instead of using a colour gradient from the standard time series colour to lighter tints. The lines were drawn, but drawn in white. Good grief. Fixed