minor class interface changes

utils/ires.h

@@ -18,6 +18,7 @@ public:
     bool is_addon() const { return m_addon; }
     double get_age() const { return m_age; }
     bool has_rnb() const { return m_has_rnb; }
+    const std::string& get_orbit_id() const { return m_orbitid; }
 private:
     std::string m_orbitid;
     Vect6 m_vec;