Error message editing in backend/bootstrap, /lib, /nodes, /port.

src/backend/bootstrap/bootparse.y

src/backend/bootstrap/bootscanner.l

src/backend/bootstrap/bootstrap.c

src/backend/lib/dllist.c

src/backend/nodes/bitmapset.c

src/backend/nodes/copyfuncs.c

src/backend/nodes/equalfuncs.c

src/backend/nodes/list.c

src/backend/nodes/outfuncs.c

src/backend/nodes/print.c

src/backend/nodes/read.c

src/backend/nodes/readfuncs.c

src/backend/port/beos/sem.c

src/backend/port/beos/support.c

src/backend/port/dynloader/bsdi.c

src/backend/port/dynloader/linux.c

src/backend/port/dynloader/ultrix4.c

src/backend/port/ipc_test.c

src/backend/port/posix_sema.c

src/backend/port/sysv_sema.c