pgsql: Implement ALTER TABLE .. SET LOGGED / UNLOGGED

Implement ALTER TABLE .. SET LOGGED / UNLOGGED

This enables changing permanent (logged) tables to unlogged and
vice-versa.

(Docs for ALTER TABLE / SET TABLESPACE got shuffled in an order that
hopefully makes more sense than the original.)

Author: Fabrízio de Royes Mello
Reviewed by: Christoph Berg, Andres Freund, Thom Brown
Some tweaking by Álvaro Herrera

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/f41872d0c1239d36ab03393c39ec0b70e9ee2a3c

Modified Files
--------------
doc/src/sgml/ref/alter_table.sgml | 64 ++++----
src/backend/commands/cluster.c | 46 +++---
src/backend/commands/matview.c | 9 +-
src/backend/commands/tablecmds.c | 239 ++++++++++++++++++++++++++++-
src/backend/parser/gram.y | 17 +-
src/bin/psql/tab-complete.c | 4 +-
src/include/commands/cluster.h | 2 +-
src/include/nodes/parsenodes.h | 2 +
src/include/parser/kwlist.h | 1 +
src/test/regress/expected/alter_table.out | 91 +++++++++++
src/test/regress/sql/alter_table.sql | 52 +++++++
11 files changed, 472 insertions(+), 55 deletions(-)