cleanup

Signed-off-by: Mattias Andrée <maandree@operamail.com>
doc

Signed-off-by: Mattias Andrée <maandree@operamail.com>
cleanup + fix cursor jump bug on mark setting

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add killring class for cleaner code

Signed-off-by: Mattias Andrée <maandree@operamail.com>