Add TEMP tables/indexes. Add COPY pfree(). Other cleanups.

doc/src/sgml/ref/copy.sgml

doc/src/sgml/ref/create_table.sgml

doc/src/sgml/ref/select.sgml

doc/src/sgml/ref/set.sgml

src/Makefile.global.in

src/backend/access/heap/hio.c

src/backend/access/transam/xact.c

src/backend/bootstrap/bootparse.y

src/backend/catalog/heap.c

src/backend/catalog/index.c

src/backend/catalog/indexing.c

src/backend/commands/cluster.c

src/backend/commands/copy.c

src/backend/commands/creatinh.c

src/backend/commands/defind.c

src/backend/commands/recipe.c

src/backend/commands/rename.c

src/backend/commands/view.c

src/backend/executor/execAmi.c

src/backend/executor/execMain.c