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Cotoposes - #440
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This is a very quick PR that dualizes various topos-like properties (cf. #364 which aims to dualize all recorded properties). It adds four properties:
They are automatically decided for all categories in the database. The only elementary cotoposes in the database are the three trivial categories (1, Isom, Setindisc) and Setop. Maybe we find more interesting examples at some point. The same holds for Grothendieck cotoposes and precotoposes. There are a few more quasicotoposes, though.