Functions, descriptors, unbound methods...

The primary motivation for implementing these properly would be to allow us to set Py_OptimizeFlag to 0, which I think it should be. However, if it's non-zero, numpy's arr_add_docstring will will make some perfectly reasonable assumptions which, unfortunately, lead to segfaults under Ironclad. However, even if we made that function run without crashing, we'd need to do really horrible things to make the newly-set docstrings appear in IronPython.