Revert updatable views

doc/src/sgml/catalogs.sgml

doc/src/sgml/intro.sgml

doc/src/sgml/ref/create_view.sgml

src/backend/commands/view.c

src/backend/rewrite/Makefile

src/backend/rewrite/rewriteDefine.c

src/backend/rewrite/rewriteHandler.c

src/backend/rewrite/rewriteRemove.c

src/backend/rewrite/viewUpdate.c

src/backend/utils/cache/relcache.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dump.h

src/include/catalog/catversion.h

src/include/catalog/pg_rewrite.h

src/include/rewrite/prs2lock.h

src/include/rewrite/rewriteDefine.h

src/include/rewrite/rewriteRemove.h

src/include/rewrite/viewUpdate.h

src/test/regress/expected/alter_table.out

src/test/regress/expected/create_view.out