- refactored some code to do with how contacts are imported - Vcards (and ContactData) instances now generate a CacheIdentifier when they are finalised so that ContactData instances that do not have enough information to identify them can be discovered then - importContact() now calls the private method checkForDuplicate(), renamed from isImportRequired(), and return if it is not - importContact() and checkForDuplicate() now use the ContactData's generated CacheIdentifier