multiple changes: changing name of the output tarball, dealing with other format of logfiles for older data, dealing with the case when the feedback file is missing, checking for 'users' data in the old tarballs, + multiple minor fixes
multiple changes: changing name of the output tarball, dealing with other format of logfiles for older data, dealing with the case when the feedback file is missing, checking for 'users' data in the old tarballs, + multiple minor fixes