Handle references to locations

[mminer237]

Often legal descriptions will say "along the East Line" or "along the public road". Often they'll go along a river or drainage ditch or fence or right-of-way too. Similarly, they'll say "parallel to the East line of said Southwest Quarter of said Section" or "parallel to the Southern boundary line of this tract". It sounds rather complicated to implement and handle all the variations and logic, but it's fairly critical as otherwise it gets completely tripped up by such extra information as it suddenly tries to figure out what we're doing with all these directions and quarters. (It sees "East, along the South Line of the East Half" as "East South East Half" and knows you don't normally have a "Southeast Half".)