DOCTYPEs in result documents

Several of the results for the NIST tests include document type 
declarations of the form:

<!DOCTYPE x>

It's not clear why these are present. I don't think they have any effect 
on the infoset. Since XOM doesn't generate such DOCTYPE declarations by 
default, I had to delete these to make the tests pass.

I noticed this in NIST tests 1, 16, 22, 34, 35, 36, 37, 38, and 50.

--
Elliotte Rusty Harold