Added new class FilePathNamePrefixCompactor that has static methods for taking a group of file names and reformatting the paths of each file name so that only the unique suffix is displayed.  Users sometimes have file with very long paths and there is insufficient room in GUI componenents to display the full path so that the user can uniquely identify each file, particularly when there are files with the same name but different paths.
Resolve WB-448 part 2: In chart file selection combo box, format the files as 'filename (..../unique file path suffix/)' so that user can see the unique part of the path for instances when there file loaded that have the same name but different paths.