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(not mandatory to compile, but the previous position looked awkward)

combining common cases.

added some more test cases.

removed before releasing the wrapper code.  Compiler will detect if
any of them is forgotten to be cleaned up.

(there doesn't seem to be need for updating the python doc)

as suggested in review.  hid the concrete derived class in the implementation.
adjusted tests accordingly.

so that it can hold both normal name tree and NSEC3 space.  a simple test case
was added.

we should either/both consider revisiting the interface so we avoid the
issue as a result or require higher version of boost.  but for now this
should be okay.