Modified clip HDF5 files creation script.
Modified clip HDF5 files creation script.

The script used to include extraction start offset and duration
attributes in the clips group. For consistency with the clips HDF5
exporter, it no longer does this.
HaroldMills/Vesper,HaroldMills/Vesper,HaroldMills/Vesper,HaroldMills/Vesper,HaroldMills/Vesper