Followup to 7fe2f20aedf5f2fdc8eb830a28d5727fa1297d26; the header argument to new_table was also not being passed through to from_columns.

git-svn-id: http://svn6.assembla.com/svn/pyfits/trunk@2761 ed100bfc-0583-0410-97f2-c26b58777a21