overhaul chain system

This made the code so fast, that the `board` benchmark became completely useless.
So that benchmark was removed.

Overall, we're looking at a futher 20% performance increase in `future_moves`

src/main.rs

@@ -1,4 +1,3 @@
-use elo::run;
 use game::Game;
 use logic::{ChildrenEvalMethod, FutureMoveConfig};
 use repr::Piece;
@@ -13,8 +12,8 @@ pub mod repr;
 
 // TODO! make this agent configuration a config option via `clap-rs`
 fn main() {
-    run();
-    return;
+    // run();
+    // return;
     let player1 = complexagent::ComplexAgent::new(
         Piece::Black,
         FutureMoveConfig {