update/fix work area layouts for "1A_BL_BN.csv" and "3-extended.csv"

[allan-lu]

1. Split the X-Y coordinates into individual values as shown in Appendix 19 of the Geosupport UPG
2. In row 29 "Latitude of From Intersection", the "to" value should be 723 not 713. This is a typo carried over from Appendix 13.
3. Plus some other minor fixes that don't have any impact on the outputs.