python - be: Fixes and 8.1 compilation.

Log Message:
-----------
Fixes and 8.1 compilation.

Plug leaks.
Implement basic Portal creation based on cursor name.
Make Postgres.Query use a memory context for storing the rpt, qtree, and plan.
Make Postgres.Query use an execution context for running and initialization.
Remove leaks by not running in top. However, be sure reallocate all permanent
objects in the PythonMemoryContext(Top for now).
Fix Portals, encodings and Query for 8.1.
Force garbage collection at the end of the transaction.
Remove some dead code.
Other various fixes and cleanups.

Modified Files:
--------------
be:
setup.py (r1.18 -> r1.19)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/setup.py.diff?r1=1.18&r2=1.19)
be/include/pypg:
call.h (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/call.h.diff?r1=1.5&r2=1.6)
cis.h (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/cis.h.diff?r1=1.6&r2=1.7)
externs.h (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/externs.h.diff?r1=1.10&r2=1.11)
heaptuple.h (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/heaptuple.h.diff?r1=1.5&r2=1.6)
postgres.h (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/postgres.h.diff?r1=1.7&r2=1.8)
query.h (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/query.h.diff?r1=1.6&r2=1.7)
tupledesc.h (r1.6 -> r1.7)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/tupledesc.h.diff?r1=1.6&r2=1.7)
utils.h (r1.5 -> r1.6)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/utils.h.diff?r1=1.5&r2=1.6)
be/include/pypg/call:
portal.h (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/call/portal.h.diff?r1=1.4&r2=1.5)
be/include/pypg/type:
object.h (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/include/pypg/type/object.h.diff?r1=1.1&r2=1.2)
be/src:
constants.c (r1.9 -> r1.10)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/constants.c.diff?r1=1.9&r2=1.10)
conv.c (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/conv.c.diff?r1=1.8&r2=1.9)
encoding.c (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/encoding.c.diff?r1=1.3&r2=1.4)
error.c (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/error.c.diff?r1=1.10&r2=1.11)
function.c (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/function.c.diff?r1=1.10&r2=1.11)
globals.c (r1.9 -> r1.10)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/globals.c.diff?r1=1.9&r2=1.10)
heaptuple.c (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/heaptuple.c.diff?r1=1.7&r2=1.8)
module.c (r1.22 -> r1.23)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/module.c.diff?r1=1.22&r2=1.23)
pl.c (r1.26 -> r1.27)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/pl.c.diff?r1=1.26&r2=1.27)
query.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/query.c.diff?r1=1.12&r2=1.13)
tupledesc.c (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/tupledesc.c.diff?r1=1.8&r2=1.9)
type.c (r1.13 -> r1.14)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/type.c.diff?r1=1.13&r2=1.14)
utils.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/utils.c.diff?r1=1.12&r2=1.13)
be/src/call:
function.c (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/call/function.c.diff?r1=1.7&r2=1.8)
pl.c (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/call/pl.c.diff?r1=1.11&r2=1.12)
portal.c (r1.8 -> r1.9)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/call/portal.c.diff?r1=1.8&r2=1.9)
be/src/type:
bitwise.c (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/type/bitwise.c.diff?r1=1.1&r2=1.2)
object.c (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/type/object.c.diff?r1=1.1&r2=1.2)
record.c (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/be/src/type/record.c.diff?r1=1.1&r2=1.2)