pgsql: Remove double-quoting of table names in clusterdb. BACKWARD COM

Remove double-quoting of table names in clusterdb. BACKWARD COMPABILITY
BREAKAGE.

Remove double-quoting of index/table names in reindexdb. BACKWARD
COMPABILITY BREAKAGE.

Document thate user/database names are preserved with double-quoting by
command-line tools like vacuumdb.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/d68ccf536e950a07b5a7030bf609936fe65aab51

Modified Files
--------------
doc/src/sgml/ref/createdb.sgml | 7 +++++--
doc/src/sgml/ref/createlang.sgml | 3 ++-
doc/src/sgml/ref/droplang.sgml | 1 +
doc/src/sgml/reference.sgml | 8 ++++++++
src/bin/scripts/clusterdb.c | 2 +-
src/bin/scripts/createlang.c | 1 +
src/bin/scripts/droplang.c | 1 +
src/bin/scripts/reindexdb.c | 4 ++--
8 files changed, 21 insertions(+), 6 deletions(-)