Added two programs to help in analyzing route statistics.

tbsetup/ipassign/src/add-x.cc

+// add-x.cc
+
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    double current = 0.0;
+    double total = 0.0;
+    cin >> current;
+    while (cin)
+    {
+        cout << total << ' ' << current << endl;
+        total += 0.01;
+        cin >> current;
+    }
+    return 0;
+}

tbsetup/ipassign/src/difference.cc

+// difference.cc
+
+#include <iostream>
+#include <fstream>
+#include <string>
+
+using namespace std;
+
+int main(int argc, char * argv[])
+{
+    if (argc == 3)
+    {
+        ifstream ideal(argv[1], ios::in);
+        ifstream candidate(argv[2], ios::in);
+        ofstream relative((argv[2] + string(".relative")).c_str(),
+                         ios::out | ios::trunc);
+        ofstream absolute((argv[2] + string(".absolute")).c_str(),
+                         ios::out | ios::trunc);
+        if (ideal && candidate && relative && absolute)
+        {
+            int left = 0;
+            int right = 0;
+            ideal >> left;
+            candidate >> right;
+            while (ideal && candidate)
+            {
+                absolute << (right - left) << endl;
+                double num = right - left;
+                double denom = right;
+                if (right != 0)
+                {
+                    relative << (num/denom) << endl;
+                }
+                ideal >> left;
+                candidate >> right;
+            }
+        }
+    }
+    return 0;
+}