Improve assert log for mismatched MD tag reads
Improve assert log for mismatched MD tag reads

Include insertion length along with the MD and CIGAR details in assert error

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