Allowed Forest Roads Simulation HeuristicForNetworkConstruction values
dot-frsHeuristics.RdCanonical user-guide spelling. The upstream parser does case-sensitive
string comparison against "Random", "Closestfirst", "Farthestfirst",
so .frsHeuristicForWrite() translates these canonical names to the
parser-accepted form before they are written to the extension's input file.