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Vibrio Melancholia authored
PerformInCategory performs a PageFunction (function taking in a filename and returning an error) in all pages and subcats in a category and returns a slice of all errors it returns. Category need not start with "Category:". Added more notes with OpenAndUpload & BatchUpload: OpenAndUpload need not start with "File:" and BatchUpload's paramFunc may have filename set to empty string or just return nil.