Recompute meta/stats.json and fix info.json for training

Regenerate non-empty dataset stats

Clean merge of ETHrobotlearning/tv-config6-blue-green-red-clean-aug5p, ETHrobotlearning/tv-config5-green-blue-red-clean-aug5p, ETHrobotlearning/tv-config4-blue-red-green-clean-aug5p, ETHrobotlearning/tv-config3-red-blue-green-clean-aug5p, ETHrobotlearning/tv-config2-red-green-blue-clean-aug5p, ETHrobotlearning/tv-config1-green-red-blue-clean-aug5p

initial commit