[IMP] split state field in two boolean fields with the same feature in b...

with the same feature in base delivery_carrier_label

validated on https://code.launchpad.net/~akretion-team/carriers-deliveries/7-split-default-option-state-from-deliv-method-dbl/+merge/224027

this PR replace the previous closed
"By the way why second is it the preferred one ?"
Because natural fast read of the eyes are from the top level left to bottom right
OR in the left, like says Yannick, seems to be more readable for me too but you noticed "the preferred ..." killer sentence ;-) so ...

my 2 cents