new feature extra dir

- you can now overwrite your target root dir files with either
 - creating a directory extra/ and put a complet file hierarchy into it
 - creating a directory anywhere and using make extra=/path/to/dir

both methods will copy the file hierarchy over root dir and then will
create images and tar balls.

useful for overwriten default configuration or adding non packaged
software like java runtime environment.

suggested by Joerg S.

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