pgsql: Add GUC temp_tablespaces to provide a default location for

Log Message:
-----------
Add GUC temp_tablespaces to provide a default location for temporary
objects.

Jaime Casanova

Modified Files:
--------------
pgsql/doc/src/sgml:
config.sgml (r1.104 -> r1.105)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml.diff?r1=1.104&r2=1.105)
pgsql/src/backend/commands:
indexcmds.c (r1.153 -> r1.154)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/indexcmds.c.diff?r1=1.153&r2=1.154)
tablecmds.c (r1.211 -> r1.212)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c.diff?r1=1.211&r2=1.212)
tablespace.c (r1.40 -> r1.41)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablespace.c.diff?r1=1.40&r2=1.41)
pgsql/src/backend/executor:
execMain.c (r1.284 -> r1.285)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execMain.c.diff?r1=1.284&r2=1.285)
pgsql/src/backend/storage/file:
fd.c (r1.134 -> r1.135)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/file/fd.c.diff?r1=1.134&r2=1.135)
pgsql/src/backend/utils/misc:
guc.c (r1.369 -> r1.370)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c.diff?r1=1.369&r2=1.370)
postgresql.conf.sample (r1.204 -> r1.205)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/postgresql.conf.sample.diff?r1=1.204&r2=1.205)
pgsql/src/include/commands:
tablespace.h (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/tablespace.h.diff?r1=1.14&r2=1.15)
pgsql/src/include/utils:
guc.h (r1.78 -> r1.79)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/guc.h.diff?r1=1.78&r2=1.79)