Fixed the following defects
On writing a PI Based Alignment the POB Coordinate values were transposed.
On reading a Vertical Alignment, Asymmetrical Vertical Curves were not read correctly
If you created a PI Based HAL and saved it and then reopened it to add a Vertical Alignment, it would incorrectly read the vertical alignment as a horizontal alignment
We added the ability to add the third column into a slope table for the vertical curves at the change points.