BIG rewrite and changes (too many to list)

src/grid.rs

@@ -4,8 +4,8 @@ use crate::{
 };
 
 use rand::{distributions::Uniform, Rng};
-
 use std::fmt::{Display, Formatter};
+use rayon::{iter::ParallelIterator, prelude::*};
 
 // A population configuration.
 #[derive(Debug)]
@@ -159,6 +159,22 @@ impl Grid {
         );
     }
 
+    #[inline]
+    pub fn tick(&mut self) {
+        let self_immutable = self.clone();
+        self.agents.par_iter_mut().for_each(|agent| {
+            agent.tick(&self_immutable);
+        });
+    }
+
+    #[inline]
+    pub fn deposit_all(&mut self) {
+        let agent_list = self.agents.clone();
+        for agent in agent_list.iter() {
+            self.deposit(agent.x, agent.y);
+        }
+    }
+
     // No longer needed (moved to imgdata.rs)
     /*
     pub fn quantile(&self, fraction: f32) -> f32 {