This patch addresses namespace and local scope using declarations. 
Unlike the using directive case, we already had separate workers for 
these, they just needed a bit of cleanup to use the new iterator and 
make them ready for the pushdecl change that's coming.  I renamed them 
consistently with the directive name change I made yesterday.

There'll be a final change to these once the other pieces have landed.

nathan
-- 
Nathan Sidwell