When dissecting DNS or NBNS queries or replies, add the item to the tree

for the queries or replies first, then create and add the subtree and
populate it, and, when that's done, set the length of the item
appropriately; if you add the subtree later, the subtree's top-level
node appears to have level 0, rather than 1 greater than the tree of
which it's a subtree, which causes those trees not to print correctly.

svn path=/trunk/; revision=122

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