Robinson Hemingway Bypass

First mod, so bear with me. This adds a secondary line from the siding at Hemingway up to the other end of Alarka Junction, with one line rejoining the main and the other continuing direct to Robinson's Gap to the coal mine. Should be more than sufficient to allow longer trains to divert around the junction, or permit traffic to pass when switching from the main end of the yard. Also added a slight realignment of the main out of Hemingway, after laying the secondary the main felt like it had sharper turns connected by straight sections so now it should flow a little better. Signals appear to function properly around the junction, unsure if/how CTC will be affected as I don't take advantage of that feature. Should not conflict with any track mods outside of ones that double track your map from Sylva-Andrews.