This adds functionality to programmatically add subcategories (with a suitable warning not to do so after the initialisation stage), and uses that to perform a splitting of the subcategories supplied the KNewStuff backend.
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- R134:29be60b13647: Split up subcategories for KNS categories
Previously: Many categories, with annoying and bad readability
With patch: A nice dig-down tree of categories in the KDE Store applications category