Bug in collecting counts?

shouldn't line 225 use j+1 instead of j?

```
emp_feat += DiagonalAlignment::Feature(j, i, trg.size(), src.size()) * p;
```

in the surrounding loops, i ranges from 1 to src.size() inclusive and j from 0 to trg.size() exclusive. Further up in the code, j+1 is used as well, and I think the feature calculation assumes the same.

This bug would bias it towards a flatter distribution I think, but I'm not sure.