pgsql-server: Fire non-deferred AFTER triggers immediately upon query

Log Message:
-----------
Fire non-deferred AFTER triggers immediately upon query completion,
rather than when returning to the idle loop. This makes no particular
difference for interactively-issued queries, but it makes a big difference
for queries issued within functions: trigger execution now occurs before
the calling function is allowed to proceed. This responds to numerous
complaints about nonintuitive behavior of foreign key checking, such as
http://archives.postgresql.org/pgsql-bugs/2004-09/msg00020.php, and
appears to be required by the SQL99 spec.
Also take the opportunity to simplify the data structures used for the
pending-trigger list, rename them for more clarity, and squeeze out a
bit of space.

Modified Files:
--------------
pgsql-server/doc/src/sgml/ref:
set_constraints.sgml (r1.11 -> r1.12)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/ref/set_constraints.sgml.diff?r1=1.11&r2=1.12)
pgsql-server/doc/src/sgml:
release.sgml (r1.294 -> r1.295)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/release.sgml.diff?r1=1.294&r2=1.295)
pgsql-server/src/backend/access/transam:
xact.c (r1.186 -> r1.187)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/transam/xact.c.diff?r1=1.186&r2=1.187)
pgsql-server/src/backend/commands:
copy.c (r1.230 -> r1.231)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/copy.c.diff?r1=1.230&r2=1.231)
explain.c (r1.124 -> r1.125)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/explain.c.diff?r1=1.124&r2=1.125)
portalcmds.c (r1.33 -> r1.34)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/portalcmds.c.diff?r1=1.33&r2=1.34)
trigger.c (r1.171 -> r1.172)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/trigger.c.diff?r1=1.171&r2=1.172)
pgsql-server/src/backend/executor:
functions.c (r1.87 -> r1.88)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/executor/functions.c.diff?r1=1.87&r2=1.88)
spi.c (r1.125 -> r1.126)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/executor/spi.c.diff?r1=1.125&r2=1.126)
pgsql-server/src/backend/tcop:
postgres.c (r1.430 -> r1.431)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/tcop/postgres.c.diff?r1=1.430&r2=1.431)
pquery.c (r1.85 -> r1.86)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/tcop/pquery.c.diff?r1=1.85&r2=1.86)
utility.c (r1.228 -> r1.229)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/tcop/utility.c.diff?r1=1.228&r2=1.229)
pgsql-server/src/backend/utils/adt:
ri_triggers.c (r1.71 -> r1.72)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/ri_triggers.c.diff?r1=1.71&r2=1.72)
pgsql-server/src/include/commands:
trigger.h (r1.48 -> r1.49)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/commands/trigger.h.diff?r1=1.48&r2=1.49)
pgsql-server/src/test/regress/expected:
foreign_key.out (r1.36 -> r1.37)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/expected/foreign_key.out.diff?r1=1.36&r2=1.37)
plpgsql.out (r1.19 -> r1.20)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/expected/plpgsql.out.diff?r1=1.19&r2=1.20)
pgsql-server/src/test/regress/sql:
plpgsql.sql (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/sql/plpgsql.sql.diff?r1=1.14&r2=1.15)