Add ignorable option to adjustment settings, this can be used if you want to have settings specified for monitors that are not currently plugged in as is now possible because of the EDID addition

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add missing declaration of extended selction data size

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