Updated test/ to match the new explicit YAML format.

Updated test/ to match the new explicit YAML format.

And other minor tweaks to get things passing again.
  $ nosetests --with-doctest --doctest-tests -vv test/ 2>&1 | less
  ...
  Ran 27 tests in 43.349s

  OK

Note that the tutorial.py and note.py tests were going so slowly
before (but are fast again now) because I was (re)loading
playlist/curve/etc. items in .__setstate__, when they are supposed to
be set with `listitems`.  If you're going to go messing around with
__getstate__ or __setstate__, it would be a good idea to read
  http://www.python.org/dev/peps/pep-0307/
(especially Case 2 and Case 3) *carefully* before wasting a bunch
of time and confusion bungling around like I did ;).