pgsql-server: Invent ResourceOwner mechanism as per my recent proposal,

Log Message:
-----------
Invent ResourceOwner mechanism as per my recent proposal, and use it to
keep track of portal-related resources separately from transaction-related
resources. This allows cursors to work in a somewhat sane fashion with
nested transactions. For now, cursor behavior is non-subtransactional,
that is a cursor's state does not roll back if you abort a subtransaction
that fetched from the cursor. We might want to change that later.

Modified Files:
--------------
pgsql-server/contrib/userlock:
user_locks.c (r1.12 -> r1.13)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/contrib/userlock/user_locks.c.diff?r1=1.12&r2=1.13)
pgsql-server/src/backend/access/gist:
gistscan.c (r1.52 -> r1.53)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/gist/gistscan.c.diff?r1=1.52&r2=1.53)
pgsql-server/src/backend/access/hash:
hashscan.c (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/hash/hashscan.c.diff?r1=1.34&r2=1.35)
pgsql-server/src/backend/access/nbtree:
nbtree.c (r1.118 -> r1.119)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/nbtree/nbtree.c.diff?r1=1.118&r2=1.119)
pgsql-server/src/backend/access/rtree:
rtscan.c (r1.52 -> r1.53)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/rtree/rtscan.c.diff?r1=1.52&r2=1.53)
pgsql-server/src/backend/access/transam:
xact.c (r1.170 -> r1.171)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/access/transam/xact.c.diff?r1=1.170&r2=1.171)
pgsql-server/src/backend/bootstrap:
bootparse.y (r1.70 -> r1.71)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/bootstrap/bootparse.y.diff?r1=1.70&r2=1.71)
bootstrap.c (r1.186 -> r1.187)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/bootstrap/bootstrap.c.diff?r1=1.186&r2=1.187)
pgsql-server/src/backend/catalog:
pg_proc.c (r1.116 -> r1.117)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/catalog/pg_proc.c.diff?r1=1.116&r2=1.117)
pgsql-server/src/backend/commands:
portalcmds.c (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/portalcmds.c.diff?r1=1.28&r2=1.29)
pgsql-server/src/backend/storage/buffer:
bufmgr.c (r1.172 -> r1.173)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/storage/buffer/bufmgr.c.diff?r1=1.172&r2=1.173)
localbuf.c (r1.56 -> r1.57)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/storage/buffer/localbuf.c.diff?r1=1.56&r2=1.57)
pgsql-server/src/backend/storage/lmgr:
lock.c (r1.134 -> r1.135)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/storage/lmgr/lock.c.diff?r1=1.134&r2=1.135)
proc.c (r1.149 -> r1.150)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/storage/lmgr/proc.c.diff?r1=1.149&r2=1.150)
pgsql-server/src/backend/storage/smgr:
smgr.c (r1.76 -> r1.77)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/storage/smgr/smgr.c.diff?r1=1.76&r2=1.77)
pgsql-server/src/backend/tcop:
postgres.c (r1.423 -> r1.424)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/tcop/postgres.c.diff?r1=1.423&r2=1.424)
pquery.c (r1.80 -> r1.81)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/tcop/pquery.c.diff?r1=1.80&r2=1.81)
pgsql-server/src/backend/utils:
Makefile (r1.22 -> r1.23)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/Makefile.diff?r1=1.22&r2=1.23)
pgsql-server/src/backend/utils/cache:
catcache.c (r1.113 -> r1.114)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/cache/catcache.c.diff?r1=1.113&r2=1.114)
relcache.c (r1.206 -> r1.207)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/cache/relcache.c.diff?r1=1.206&r2=1.207)
pgsql-server/src/backend/utils/mmgr:
portalmem.c (r1.66 -> r1.67)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/mmgr/portalmem.c.diff?r1=1.66&r2=1.67)
pgsql-server/src/include/access:
gistscan.h (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/access/gistscan.h.diff?r1=1.23&r2=1.24)
hash.h (r1.55 -> r1.56)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/access/hash.h.diff?r1=1.55&r2=1.56)
nbtree.h (r1.79 -> r1.80)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/access/nbtree.h.diff?r1=1.79&r2=1.80)
rtree.h (r1.33 -> r1.34)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/access/rtree.h.diff?r1=1.33&r2=1.34)
xact.h (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/access/xact.h.diff?r1=1.64&r2=1.65)
pgsql-server/src/include/commands:
portalcmds.h (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/commands/portalcmds.h.diff?r1=1.14&r2=1.15)
pgsql-server/src/include/storage:
bufmgr.h (r1.83 -> r1.84)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/storage/bufmgr.h.diff?r1=1.83&r2=1.84)
lock.h (r1.78 -> r1.79)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/storage/lock.h.diff?r1=1.78&r2=1.79)
proc.h (r1.68 -> r1.69)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/storage/proc.h.diff?r1=1.68&r2=1.69)
smgr.h (r1.45 -> r1.46)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/storage/smgr.h.diff?r1=1.45&r2=1.46)
pgsql-server/src/include/utils:
catcache.h (r1.49 -> r1.50)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/catcache.h.diff?r1=1.49&r2=1.50)
portal.h (r1.49 -> r1.50)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/portal.h.diff?r1=1.49&r2=1.50)
rel.h (r1.75 -> r1.76)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/rel.h.diff?r1=1.75&r2=1.76)
relcache.h (r1.41 -> r1.42)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/relcache.h.diff?r1=1.41&r2=1.42)
pgsql-server/src/test/regress/expected:
transactions.out (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/expected/transactions.out.diff?r1=1.5&r2=1.6)
pgsql-server/src/test/regress/sql:
transactions.sql (r1.5 -> r1.6)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/sql/transactions.sql.diff?r1=1.5&r2=1.6)

Added Files:
-----------
pgsql-server/src/backend/utils/resowner:
Makefile (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/resowner/Makefile?rev=1.1&content-type=text/x-cvsweb-markup)
README (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/resowner/README?rev=1.1&content-type=text/x-cvsweb-markup)
resowner.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/resowner/resowner.c?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql-server/src/include/utils:
resowner.h (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/resowner.h?rev=1.1&content-type=text/x-cvsweb-markup)