implemented getpathlen for header and payload. Fixes #2

src/Nloc.java

@@ -97,6 +97,22 @@ public class Nloc {
   //  return pump;
   //}
 
+  public int getPayloadPathlength(List<Channel> path) {
+    int len = 0;
+    for (Channel ch: path) {
+      len += ch.getPSteps(); 
+    }
+    return len;
+  }
+
+  public int getHeaderPathlength(List<Channel> path) {
+    int len = 0;
+    for (Channel ch: path) {
+      len += ch.getHSteps(); 
+    }
+    return len;
+  }
+
   public boolean allDropletsInSink() {
     boolean allInSink = true;
     for (Droplet dr : dropletList) {