Apply message style guide to frontend programs.

src/bin/initdb/initdb.sh

src/bin/initlocation/initlocation.sh

src/bin/ipcclean/ipcclean.sh

src/bin/pg_config/pg_config.sh

src/bin/pg_controldata/pg_controldata.c

src/bin/pg_ctl/pg_ctl.sh

src/bin/pg_dump/common.c

src/bin/pg_dump/pg_backup_archiver.c

src/bin/pg_dump/pg_backup_custom.c

src/bin/pg_dump/pg_backup_db.c

src/bin/pg_dump/pg_backup_tar.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dumpall.c

src/bin/pg_dump/pg_restore.c

src/bin/pg_resetxlog/pg_resetxlog.c

src/bin/psql/command.c

src/bin/psql/common.c

src/bin/psql/copy.c

src/bin/psql/describe.c

src/bin/psql/help.c