Changed fixInsertion to always augment parent

This changes fixInsertion to always augment the node's parent, even if the initial call to augment() returns false, assuming "augment" is true.  When we insert a node, we are supposed to ignore its initial state; thus, we ignore the return value of augment().

src/com/github/btrekkie/red_black_node/RedBlackNode.java

@@ -242,11 +242,9 @@ public abstract class RedBlackNode<N extends RedBlackNode<N>> implements Compara
         if (!isRed) {
             throw new IllegalArgumentException("The node must be red");
         }
-        boolean changed;
+        boolean changed = augment;
         if (augment) {
-            changed = augment();
-        } else {
-            changed = false;
+            augment();
         }
 
         RedBlackNode<N> node = this;
@@ -569,7 +567,6 @@ public abstract class RedBlackNode<N extends RedBlackNode<N>> implements Compara
                     parent.right = child;
                 }
             }
-            parent = null;
             child.isRed = false;
             if (child.parent != null) {
                 N parent;
@@ -590,7 +587,6 @@ public abstract class RedBlackNode<N extends RedBlackNode<N>> implements Compara
                 parent.right = leaf;
                 sibling = parent.left;
             }
-            this.parent = null;
             if (!isRed) {
                 RedBlackNode<N> siblingNode = sibling;
                 siblingNode.fixSiblingDeletion();