VA: US 15 Minor Point Errors From Orange to MD

[Markkos1992]

Points on the US 29 concurrency were accounted for on that thread.

1.   FoxLn point seems to be better served at SR 704 (Harmony Church Rd) or a number of roads just south of Leesburg.  I had debates on MapLawnLn and CouFarmLn as well.
2.   SaiClaRd should be SaiClaLn.
3.   LowRd should be LovRd.
4.   Off-center points (SR 614, VA/MD) 

[mapmikey]

Fixed these plus changed the VA/MD point on the Maryland US 15 file.  In queue...