Move MS tests on caption element
more assertions
fix test
small improvement
Rewrite video_007.htm and remove obsolete copies in old-tests.
Merge pull request #483 from w3c/deniak/ms-table

Move MS tests on caption element
Merge pull request #512 from Ms2ger/Update-video-007

Rewrite video_007.htm and remove obsolete copies in old-tests; r=denis