methods.test

- generic/nsf.c, ObjectDispatch(): Re-arranged the handling of fully-qualified method dispatches with the selectors resolving to existing objects and, in particular, nested (namespace-qualified) objects. Prior to that, dispatches such as "::C ::parent::child" were not covered appropriately: ::parent was reported as valid regObj and so the dispatcher continued to dispatch to the cmd "::parent::child" in the self-context ::parent::child ... with unwanted side-effects (e.g., XOTcl's unknown handling was bypassed). - tests/methods.test: Added basic tests on the (current) handling for such ::* dispatches and a specific test set on the intended XOTcl behaviour.