pgsql-server: Cause ALTER OWNER commands to update the object's ACL,

Log Message:
-----------
Cause ALTER OWNER commands to update the object's ACL, replacing references
to the old owner with the new owner. This is not necessarily right, but
it's sure a lot more likely to be what the user wants than doing nothing.
Christopher Kings-Lynne, some rework by Tom Lane.

Modified Files:
--------------
pgsql-server/src/backend/commands:
dbcommands.c (r1.138 -> r1.139)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/dbcommands.c.diff?r1=1.138&r2=1.139)
functioncmds.c (r1.49 -> r1.50)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/functioncmds.c.diff?r1=1.49&r2=1.50)
schemacmds.c (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/schemacmds.c.diff?r1=1.20&r2=1.21)
tablecmds.c (r1.122 -> r1.123)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/tablecmds.c.diff?r1=1.122&r2=1.123)
tablespace.c (r1.6 -> r1.7)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/commands/tablespace.c.diff?r1=1.6&r2=1.7)
pgsql-server/src/backend/utils/adt:
acl.c (r1.107 -> r1.108)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/acl.c.diff?r1=1.107&r2=1.108)
pgsql-server/src/include/utils:
acl.h (r1.71 -> r1.72)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/utils/acl.h.diff?r1=1.71&r2=1.72)