Fix the pxd file for libcpp.complex

avoid runtime 'in' tests for dict literals when we can determine at compile time that there are no duplicate keys

Fix two small sphinx errors in the tutorials

Added it to libcpp_all (where it should have been) instead
of a custom compile test.

complex isn't actually tested in libcpp_all, except that it
can be cimported

Previously it could not be cimported
Also added a test case (for cimporting the whole of the libcpp
standard library)

Conflicts:
	Cython/Utility/CythonFunction.c
	Cython/Utility/Generator.c

PyTypeObject members tp_compare, tp_richcompare, tp_base

Conflicts:
	tests/run/generators.pyx

prevent generator methods from returning NULL without setting an exception: method call protocol differs from __next__() protocol

remove test that doesn't apply to normal Python (only to the corresponding .pyx test where it remains)