Make clear whether anime are unfinished and/or continuations

[Dutchman97]

Previously in the Google Forms surveys anime series automatically had a (cour X) or (up to cour X) appended to them. Anime that were delayed or otherwise only had a few episodes in a particular season also had (and still have) multiple entries each with like (episodes X-Y) and (episodes Y-Z). The former is straightforward enough to implement, but the latter will be more difficult to implement. A partly-delayed 1-cour anime can span two or more seasons, but something like an AnimePart model will have to be implemented that extends Anime by saying that in season A episodes X-Y aired and in season B episodes Y-Z.