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Some parts of the Wikipedia are edited by bots. They are special scripts that can do extensive but unintelligent editing, such as updating links to other language wiki pages automatically.

This kind of information rich updates are created by real users. There are a lot of dedicated users on Wikipedia and most of these users constantly follow certain articles and constantly update the content. Commonly these dedicated users are experts, enthusiasts or professionals on the articles they edit.

You can examine the history page for the Roger Federer article to keep track of changes. Generally bots leave a special comment to the edits they make. So you can easily distinguish between a bot and a real editor.

Yes, it is possible, but not directly on Wikipedia itself. You would need to use Pywikipedia for this.

There is a script in Pywikipedia called category.py. Lets say "foo" is the original category and "bar" is the category you want to merge into. Use the following command:

python category.py move -from:"foo" -to:"bar"

This would move all the pages in the "foo" category to the "bar" category. So, if you have multiple categories to merge, you would have to run this script multiple times for all the categories you have.