refac: limit axis in competing skill score plot

there is an issue when a single model does perform very poor resulting in a strong negative skill score. This will destroy the information on all other skillscores because of the axis scaling.

• add a meaningfull limit (e.g. 5) to the skill score plot. Decide to limit data to the interval [-5,5] or just to limit the axis to this interval.

added Doing enhancement refactoring labels

created merge request !286 (merged) to address this issue

mentioned in merge request !286 (merged)

mentioned in commit 70f79639

added .done label and removed Doing label

added merged in Develop label and removed .done label

marked the checklist item add a meaningfull limit (e.g. 5) to the skill score plot. Decide to limit data to the interval [-5,5] or just to limit the axis to this interval. as completed

closed with merge request !318 (merged)

mentioned in commit 1634c669