[Playlist] Testsuite updates

[Sebastian Pipping]

I just split the testsuite into testcases
for XSPF-0 and XSPF-1. The directory structure
now looks like this:

  testcase
    for_version_0
      fail
      pass
    for_version_1
      fail
      pass

See it live here:
https://trac.xiph.org/browser/trunk/xspf/testcase

The testcases from libSpiff are now in there, too.
I also plan to add a more extensive order testcase
later.



Sebastian