Fix for renaming implicit directories
Detail: Some directories are implicit. If there is a file level1/level2/level3/test.txt then the folders level1, level2, level3 are implicit; they may not be included as entries in the tar file but SparkFS will create folders for display with those names.
Rename of directories had a bug that would cause the contents to get the new name of the directory. In the above example renaming 'level2' to 'levelX' would leave a file called levelX when the tar file was loaded (or forgotten via the Archive menu then reopened).