message: fix: off-by-one error in insertion position
diff: @@ -34,7 +34,9 @@ inline StripInsertionsResult<Letter> stripInsertions(const Sequence<Letter>& ref
  if (c == Letter::GAP) {
  if (currentInsertion.empty()) {
  currentInsertion = query[i];
  - insertionStart = i;
  + // NOTE: by convention we set position of insertion to be the index of a character that precedes the insertion,
  + // i.e. a position of reference nucleotide *after* which the insertion have happened.
  + insertionStart = i - 1;
  } else {
  currentInsertion += query[i];
  }
  