added start index implementation for the bounds feature: the big slice that encompasses over all hdf files
added start index implementation for the bounds feature: the big slice that encompasses over all hdf files

mkl-/scioncc,mkl-/scioncc,ooici/pyon,crchemist/scioncc,ooici/pyon,mkl-/scioncc,crchemist/scioncc,scionrep/scioncc,crchemist/scioncc,scionrep/scioncc,scionrep/scioncc