fix issue in cost estimate creation

populate the sourced_by field of the SO line with the PO line doing the
sourcing
fix error using self in api.multi method
fix UnboundLocalError
more details in test
Add an option to set a SO as cost estimate only and create a workflow that will change the Cost Estimate only once it has been sent by mail.
Hide button Confirm Cost Estimate when Cost estimate only is active
Add a filter to see all Cost Estimates Only
Filter tree view to show Done cost estimate only in Cost Estimates
Move user_id on view and rename it Business Unit Officer
Rename project_id to Project code
Add Currency related on pricelist_id
# This is a combination of 2 commits.
# The first commit's message is:

Rearange fields in view

# The 2nd commit message will be skipped:

#	Remove label "Terms and conditions"
Restore fields attributes in view
Add field remark on LO
Bump version
Improve docs on cost_estimate_only
Rename client_order_ref to Requestor Ref.
remove print statements
Merge pull request #25 from gurneyalex/8.0-fill-cost-estimate-sourced-by

fix issue in cost estimate creation
Merge pull request #32 from yvaucher/8.0-log-order-ui-imp

[8.0] Logistics Order - UI Improvements