add indent buffer command

Signed-off-by: Micky Ching <mickyching@gmail.com>
using "C-\ C-e" to track file end

Signed-off-by: Micky Ching <mickyching@gmail.com>
reduce default fill-column from 80 to 78

Signed-off-by: Micky Ching <mickyching@gmail.com>