Use generic attribute management in PL/Python

Peter Eisentraut <peter_e@gmx.net>

Commit: 983d10833e62d8f6e79e09a060e4e539b3a916c5
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2009-08-25T08:14:42Z
Releases: 9.0.0
Use generic attribute management in PL/Python

Switch the implementation of the plan and result types to generic attribute
management, as described at <http://docs.python.org/extending/newtypes.html>.
This modernizes and simplifies the code a bit and prepares for Python 3.1,
where the old way doesn't work anymore.

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