[IMP]Set Delivery Method field default value in res.partner
[IMP]remove the set default in quotation
[FIX]runbot: delivery_cost.yml
[IMP]improve delivery_cost.yml: create sales order
[MISC]typo
[IMP]remove the attrs in sale setting
[IMP]improve code
[MERGE] merged a branch with small improvements in test, demo data and usability of delivery module