Complete affinity migration from Graph to Layout

Fixes #6

GraphNode.js

@@ -3,7 +3,6 @@ class GraphNode {
     this.links = [];
     this.linksIn = [];
     this.groups = new Set();
-    this.affinity = [];
     this.pageRank = 0;
     this.subgraph = null;
   }
@@ -41,38 +40,6 @@ class GraphNode {
     }
   }
 
-  // TODO: move this to LayoutNode, item by item
-  setAffinity(nodes) {
-    const INF = 999999;
-
-    for (let node of nodes) {
-    }
-
-    for (let link of this.links) {
-      // Stronger affinity for links
-      // Prefer to move toward the target instance
-      this.addAffinity(link.to, d => d <= 2 ? -INF : d * 11);
-      link.to.addAffinity(this, d => d <= 2 ? -INF : d * 9);
-    }
-
-    // Affinity for groups
-    for (let group of this.groups) {
-      for (let node of group.nodes) {
-        this.addAffinity(node, d => d * 100);
-      }
-    }
-  }
-
-  addAffinity(node, distanceToWeight) {
-    if (this == node) {
-      return;
-    }
-    this.affinity.push({
-      node: node,
-      distanceToWeight: distanceToWeight,
-    });
-  }
-
   static process(item, soft=false) {
     if (item.label == '') {
       return null;