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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Up voted for "delete" button.
Me too, as I already stated. :-)
I'm also interested in this question. I thought after refactoring only the new solution will be present, ie the old one would be removed, unless I want it to remain present, because I made very meaningful refactoring, and I want that both solutions can be seen.