changed reopen option to multiple_iterators option
changed reopen option to multiple_iterators option

brendanofallon/pysam,daler/pysam,bioinformed/pysam,brendanofallon/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,daler/pysam,carolinux/pysam,carolinux/pysam,kyleabeauchamp/pysam,pysam-developers/pysam,nlhepler/pysam,nlhepler/pysam,daler/pysam,nlhepler/pysam,dannon/pysam,dannon/pysam,dannon/pysam,mattions/pysam,brendanofallon/pysam,kyleabeauchamp/pysam,mattions/pysam,TyberiusPrime/pysam,carolinux/pysam,brendanofallon/pysam,TyberiusPrime/pysam,mattions/pysam,mattions/pysam,dannon/pysam,bioinformed/pysam,brendanofallon/pysam,bioinformed/pysam,TyberiusPrime/pysam,nlhepler/pysam,pysam-developers/pysam,dannon/pysam,pysam-developers/pysam,kyleabeauchamp/pysam,TyberiusPrime/pysam,daler/pysam,carolinux/pysam,pysam-developers/pysam,bioinformed/pysam,nlhepler/pysam,TyberiusPrime/pysam,mattions/pysam,bioinformed/pysam,carolinux/pysam,daler/pysam