Make m_HoldNotes private.

Remove the copy ctor; no longer needed.  (Looking back, I don't
think it was needed anyway.)

stepmania/src/NoteData.h

@@ -27,17 +27,16 @@ class NoteData
 	/* Keep this aligned, so that they all have the same size. */
 	vector<TapNote> m_TapNotes[MAX_NOTE_TRACKS];
 
+	vector<HoldNote>	m_HoldNotes;
+
 public:
 	NoteData();
 	~NoteData();
 	NoteData(const NoteData &cpy);
 	void Init();
-	NoteData &operator=(const NoteData &cpy);
 
 	int			m_iNumTracks;
 
-	vector<HoldNote>	m_HoldNotes;
-
 	/* Return the note at the given track and row.  Row may be out of
 	 * range; pretend the song goes on with TAP_EMPTYs indefinitely. */
 	inline TapNote GetTapNote(unsigned track, unsigned row) const