[cddlm] import namespace tests

I've set up a new package for <import namespace /> tests, set_09_import_namespace, and moved the one existing test in there, correcting it on the way (I think it was broken). None of these tests work on my implementation, and I dont expect to have it fixed by monday. Indeed, there are some implications of the import-into-namespace process that only become clear when I think about implementing it, that we can discuss next week. How many of the tests work on other systems? -steve (p.s.I've also moved the lazy reference test 2005_02_18) to the lazy references package. That's just to make it easier to group things that are passing by feature.