plpython3

Here's my latest patch. I'm going to submit to the open commitfest. (hrm, it's 189K compressed, should I just let
peopleuse git in the future?) 

Known issues:

 - Documentation has gaps.
 - Code formatting/ws is not consistent with PG's.


Any feedback would be appreciated.


Excepting trusted and DB-API, this patch fulfills all of the current PL/Python TODOs for Python 3, and adds *many* new
features(Seethe documentation, and the WIP wiki page). 

plpython3 is intentionally incompatible with plpython as Python 3 is intentionally incompatible with Python 2. Be sure
tosee the recent discussion in the other Python 3 thread[1]. =) 


New Docs:
 http://python.projects.postgresql.org/pldocs/plpython3.html

Overview:
 http://wiki.postgresql.org/wiki/WIP:plpython3

git(plpython3 branch):
 http://git.postgresql.org/gitweb?p=plpython3.git;a=summary


Past threads on the subject:

http://archives.postgresql.org/pgsql-hackers/2009-05/msg01376.php
http://archives.postgresql.org/pgsql-hackers/2009-07/msg01519.php
http://archives.postgresql.org/pgsql-hackers/2009-08/msg01505.php

[1] http://archives.postgresql.org/pgsql-hackers/2009-11/msg00547.php