pgsql: Document that Python 2.3 requires cdecimal module for full funct

Document that Python 2.3 requires cdecimal module for full functionality.

This has been true for some time, but we were leaving users to discover it
the hard way.

Back-patch to 9.2. It might've been true before that, but we were claiming
Python 2.2 compatibility before that, so I won't guess at the exact
requirements back then.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/f3cfc23195e3363ceab49449ed851944bcaf0849

Modified Files
--------------
doc/src/sgml/installation.sgml | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

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