Return a string describing the stats

def get_stats(self):
    """Return a string describing the stats"""
    ostr = ''
    errtotal = self.deletions['total']+self.insertions['total']+self.mismatches
    ostr += "ALIGNMENT_COUNT\t"+str(self.alignment_count)+"\n"
    ostr += "ALIGNMENT_BASES\t"+str(self.alignment_length)+"\n"
    ostr += "ANY_ERROR\t"+str(errtotal)+"\n"
    ostr += "MISMATCHES\t"+str(self.mismatches)+"\n"
    ostr += "ANY_DELETION\t"+str(self.deletions['total'])+"\n"
    ostr += "COMPLETE_DELETION\t"+str(self.deletions['specific'])+"\n"
    ostr += "HOMOPOLYMER_DELETION\t"+str(self.deletions['homopolymer'])+"\n"
    ostr += "ANY_INSERTION\t"+str(self.insertions['total'])+"\n"
    ostr += "COMPLETE_INSERTION\t"+str(self.insertions['specific'])+"\n"
    ostr += "HOMOPOLYMER_INSERTION\t"+str(self.insertions['homopolymer'])+"\n"
    return ostr