Updated name from PDGTool to CIA

src/CIA.java

@@ -7,7 +7,7 @@ import java.util.*;
  * PDG Tool: Change Impact Analysis
  * Usage: java PDGTool <java-file> [line-number]
  */
-public class PDGTool {
+public class CIA {
 
     public static void main(String[] args) {
         if (args.length < 1) {

src/pdg/PDG.java

@@ -69,6 +69,7 @@ public class PDG {
 
         // 2. Compute reaching definitions
         Map<String, Map<String, Set<String>>> reaching = computeReachingDefinitions(defs);
+        // TODO: check what happens whena node has multiple variable definitions
 
         // 3. Build data dependencies
         for (Node node : cfg.nodes()) {