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Currently when a variable is renamed, all the variable history is lost. This makes it hard for users to understand/debug where values came from. Improve the code so that history is preserved across renamed variables. (Expanded variable key names are a special case of variable renaming) (Bitbake rev: 11722c989077a8751a5d0653c523760bf91e6efa) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>