Tiles management for iota²
The chain has the ability to automatically select only the useful tiles from those proposed by the user to classify a region. It is parsimonious by not treating the really useful tiles (case of overlapping tiles). It is really useful but it is a pity that it stops because no intersection is found with one of the tiles proposed by the user but which intersect the proposed region. It should only stop if no intersection is found between the tiles and the proposed region.