Show backend status on ps command line. Remove unused args from

src/backend/commands/_deadcode/version.c

src/backend/commands/dbcommands.c

src/backend/commands/user.c

src/backend/libpq/be-pqexec.c

src/backend/main/main.c

src/backend/postmaster/postmaster.c

src/backend/rewrite/rewriteDefine.c

src/backend/tcop/postgres.c

src/backend/tcop/pquery.c

src/backend/tcop/utility.c

src/include/tcop/pquery.h

src/include/tcop/tcopprot.h