[C++-sig] Bug in opaque_pointer_converter and patch

[Ganssauge, Gottfried]

While debugging a python extension I found out that a segmentation fault
was produced by the python statement
	print type(some_opaque_pointer)

After some further debugging I found out that all instances created from
opaque_pointer_converter had a type object which itself didn't have a
type, and this finally lead to the crash.

Find attached a patch which corrects this behaviour by initialising the
type object using PyType_Ready().

Cheers,

Gottfried 
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