Exposed modification time for .7z archives
Changed the order of detecting whether the archive is in .rar  format.

Its very slow with big archives and shouldn't be done when we got archive in format which can be detected fast.
Fixed handling of ustar tar files with long names.
Fixed bug causing entries of non-ustar archive being after one with very long name to be discarded
Merge branch 'rar_reorder'
Merge branch 'tar_fix'