Make AlignmentFile __dealloc__ and close more stringent
Make AlignmentFile __dealloc__ and close more stringent

pysam-developers/pysam,pysam-developers/pysam,pysam-developers/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,pysam-developers/pysam,kyleabeauchamp/pysam