src/main/Alignment.js
function makeCigarString(cigarOps: Array<CigarOp>) {
  return cigarOps.map(({op, length}) => length + op).join('');
}
function makeCigarString(cigarOps: Array<CigarOp>) {
  return cigarOps.map(({op, length}) => length + op).join('');
}
builds a cigarString string that is useful to users.