WasCreatedAsDirectProduct, WasCreatedAsCoproduct

Filters are set to true if the system can derive
a direct product/ coproduct
Installed immediate methods for DirectSum
Merge branch 'master' of momo.mathb.rwth-aachen.de:/home/gutsche/gap/repos.git/CategoriesForHomalg

* 'master' of momo.mathb.rwth-aachen.de:/home/gutsche/gap/repos.git/CategoriesForHomalg:
  Bug in InstallSet, Cache key was too long
Added Properties of HomalgCategories