Moved a bunch of text-decoration related tests into
the more appropriate css21/text/ folder; their
associated reference files have been moved too
into css21/text/ folder.

--HG--
rename : css21/text-decoration-position-001.xht => css21/text/text-decoration-position-001.xht
rename : css21/reference/text-decoration-va-length-001-ref.xht => css21/text/text-decoration-va-length-001-ref.xht
rename : css21/text-decoration-va-length-001.xht => css21/text/text-decoration-va-length-001.xht
rename : css21/reference/text-decoration-va-length-002-ref.xht => css21/text/text-decoration-va-length-002-ref.xht
rename : css21/text-decoration-va-length-002.xht => css21/text/text-decoration-va-length-002.xht
rename : css21/text-decoration-va-sub-super-001.xht => css21/text/text-decoration-va-sub-super-001.xht
rename : css21/text-decoration-va-sub-super-002.xht => css21/text/text-decoration-va-sub-super-002.xht
rename : css21/text-decoration-va-sub-super-003.xht => css21/text/text-decoration-va-sub-super-003.xht
rename : css21/text-decoration-va-sub-super-004.xht => css21/text/text-decoration-va-sub-super-004.xht