Get entity path methods should be consistent

[111pontes]

Currently, entity.get_absolute_path() is a private method, absolute_path() is being introduced as a utility function and entity.get_segment_path() is a public method. Instead, the existing entity.get_absolute_path()method should be made private and a newentity.get_absolute_path()method should provide the same functionality in theabsolute_path() utility function. The end result should be two similarly named methods (entity.get_absolute_path()andentity.get_segment_path()`). The utility function should be removed.