Add kernel pairs and cokernel pairs - #342
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This PR adds two properties of categories to the database:
These are closely related to the existence of pullbacks and pushouts, respectively, but there are notable differences. For example, Metc has cokernel pairs, but not pushouts, and Setnon-empty has kernel pairs, but not pullbacks.
Various results are proven, and the properties have been decided for all categories in the database. Also, some previous assignments of properties have turned out to be redundant.