Added buffer shrink to optimize memory
Added buffer shrink to optimize memory

iLCSoft/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,petricm/LCIO,petricm/LCIO,petricm/LCIO,petricm/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,petricm/LCIO,petricm/LCIO,iLCSoft/LCIO