message: BUGFIX: fix loop in eigen_sort()
  In the PR review, Ben Corbett pointed out that the code was erroneously
  looping over rows instead of columns. Fixed that.
diff: @@ -60,7 +60,7 @@ bool eigen_sort( T* lambdas, Matrix< T >& eigen_vectors )
  return false;
  }
  - const int n = eigen_vectors.getNumRows();
  + const int n = eigen_vectors.getNumColumns();
  for (int i = 0 ; i < n-1 ; ++i)
  {
  