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)