Evaluate move_model doesn't move model_dir (Windows)

[csheldrick]

The move_model function doesn't move the model.
os.path.join(rc.next_generation_model_dir, "copies", model_dir) returns the exact same path as model_dir, (I believe its the way os.path.join handles full paths on Windows). Since the model doesn't get moved, evaluate just repeatedly reuses this next_gen model that doesn't ever get moved. But if opt is running, the latest is loaded correctly.