Wenzel Jakob c14c2762f6 Address reference leak issue (fixes #1029) ...

Creating an instance of of a pybind11-bound type caused a reference leak in the
associated Python type object, which could prevent these from being collected
upon interpreter shutdown. This commit fixes that issue for all types that are
defined in a scope (e.g. a module). Unscoped anonymous types (e.g. custom
iterator types) always retain a positive reference count to prevent their
collection.

2017-08-25 16:02:18 +02:00

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