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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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Constructor: Give categories for objects and morphisms to category.
             Install filters for containment in category.
             Install AddToCategory, which can add an object to a category and sets the filter to true.



TODO REIMER:
Why is there a possibility to add an identity morphism without declaring it?

TODO:
* Add caching to methods
* Add generic display methods

ToDo:
* Gruppenkategorie, additive Kategorie.
* Kategorie muss lernen.
* Verallgemeinerte Morphismen Kategorie.

Bugs:
* Add( Category, object ) muss derzeit im Konstruktor aufgerufen werden (z.B bei QVectorSpace), da sonst 
  die generic Print Methoden einen Fehler werfen (HomalgCategory nicht bekannt)
* FullView: is direct sum -> was created as direct sum (ebenso: direct product, cokernel, kernel)