New WAL version - CRC and data blocks backup.

src/backend/access/heap/heapam.c

src/backend/access/nbtree/nbtinsert.c

src/backend/access/nbtree/nbtpage.c

src/backend/access/nbtree/nbtree.c

src/backend/access/transam/xact.c

src/backend/access/transam/xlog.c

src/backend/bootstrap/bootstrap.c

src/backend/commands/sequence.c

src/backend/commands/vacuum.c

src/backend/postmaster/postmaster.c

src/backend/storage/buffer/bufmgr.c

src/backend/utils/init/globals.c

src/include/access/htup.h

src/include/access/nbtree.h

src/include/access/xlog.h

src/include/catalog/catversion.h

src/include/commands/sequence.h

src/include/storage/bufmgr.h