Class hierarchy not present in stubs

[torokati44]

If class Base and class Derived : public Base are wrapped, with Base::foo() and Derived::bar() in them, the generated stub lists both foo and bar under Derived separately, instead of having class Derived(Base).

I'm not sure this matters at all for what the purpose of stubs is, but would certainly be nicer and a lot less stub code to fix up after generation.