upGlobalErrors - For

Hi,

It seems that the for loop in 'upGlobalErrors' is not updating the error values since the element's index will always be less than the array's size.

` for (er <- erreurs) {
          if (this.errors.size < er._1)
              this.errors(er._1) += er._2
  } `

Could you let me know if this loop is correct? Thanks!
