VS average and further smaller improvements

VS Average

• You now have a new tab called 'Average' on the VS Points page
• You can now compare your members performance over several weeks and see the top or low performers based on the alliance average score

Minor adjustments

• Manual tracking has been added for alliance member stats such as power, kills, THP, donations, VS points and HQ level
• CSV import has been included for Season Fight imports and Storm Planner