pgsql: Add ALTER object SET SCHEMA capability for a limited but useful

Log Message:
-----------
Add ALTER object SET SCHEMA capability for a limited but useful set of
object kinds (tables, functions, types). Documentation is not here yet.
Original code by Bernd Helmle, extensive rework by Bruce Momjian and
Tom Lane.

Modified Files:
--------------
pgsql/src/backend/catalog:
namespace.c (r1.76 -> r1.77)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/namespace.c.diff?r1=1.76&r2=1.77)
pg_constraint.c (r1.25 -> r1.26)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_constraint.c.diff?r1=1.25&r2=1.26)
pg_depend.c (r1.13 -> r1.14)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_depend.c.diff?r1=1.13&r2=1.14)
pgsql/src/backend/commands:
alter.c (r1.13 -> r1.14)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/alter.c.diff?r1=1.13&r2=1.14)
functioncmds.c (r1.64 -> r1.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/functioncmds.c.diff?r1=1.64&r2=1.65)
tablecmds.c (r1.164 -> r1.165)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c.diff?r1=1.164&r2=1.165)
typecmds.c (r1.76 -> r1.77)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/typecmds.c.diff?r1=1.76&r2=1.77)
pgsql/src/backend/nodes:
copyfuncs.c (r1.313 -> r1.314)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c.diff?r1=1.313&r2=1.314)
equalfuncs.c (r1.250 -> r1.251)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/equalfuncs.c.diff?r1=1.250&r2=1.251)
pgsql/src/backend/parser:
gram.y (r2.505 -> r2.506)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.505&r2=2.506)
pgsql/src/backend/tcop:
utility.c (r1.242 -> r1.243)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c.diff?r1=1.242&r2=1.243)
pgsql/src/include/catalog:
dependency.h (r1.15 -> r1.16)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/dependency.h.diff?r1=1.15&r2=1.16)
namespace.h (r1.35 -> r1.36)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/namespace.h.diff?r1=1.35&r2=1.36)
pg_constraint.h (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_constraint.h.diff?r1=1.16&r2=1.17)
pgsql/src/include/commands:
alter.h (r1.6 -> r1.7)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/alter.h.diff?r1=1.6&r2=1.7)
defrem.h (r1.66 -> r1.67)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/defrem.h.diff?r1=1.66&r2=1.67)
tablecmds.h (r1.22 -> r1.23)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/tablecmds.h.diff?r1=1.22&r2=1.23)
typecmds.h (r1.11 -> r1.12)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/typecmds.h.diff?r1=1.11&r2=1.12)
pgsql/src/include/nodes:
nodes.h (r1.173 -> r1.174)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/nodes.h.diff?r1=1.173&r2=1.174)
parsenodes.h (r1.287 -> r1.288)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h.diff?r1=1.287&r2=1.288)
pgsql/src/test/regress/expected:
alter_table.out (r1.88 -> r1.89)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/alter_table.out.diff?r1=1.88&r2=1.89)
pgsql/src/test/regress/sql:
alter_table.sql (r1.51 -> r1.52)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/alter_table.sql.diff?r1=1.51&r2=1.52)