=== Suggestion from JSS paper ===

* Fix warnings in dtwWindow.plot		DONE
* Add dtw.print method				DONE  
* Make type="l" default for dtw.plot		DONE
* Use NAMESPACE feature				DONE


=== Other ===

* Optimize memory use (e.g. pass distance.only to the native
  implementation and avoid returning the two large matrices)





TEST CASE for Itakura
1  0  1  1
1  1 10 10
1  1 10 10

Type IV: 3 ?
Itakura: 13 ?