[issue5890] Subclassing property doesn't preserve the auto __doc__ behavior

[Moriyoshi Koizumi]

Moriyoshi Koizumi <mozo+python at mozo.jp> added the comment:

A subclass of property doesn't always have writable __doc__, especially 
what is implemented in C.  This actually causes a problem with 
Boost.Python's StaticProperty.

References:
- http://mail.python.org/pipermail/cplusplus-sig/2009-August/014747.html
- http://lists.boost.org/Archives/boost/2009/10/157512.php
- https://bugs.launchpad.net/ubuntu/+source/boost1.38/+bug/457688

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nosy: +moriyoshi

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