New sponsorship state "Waiting Mandate"

- Still some issues to fix...
Bug fixes

- Error message when child is not selected for a sponsorship product
  moved from the on_change method to when we validate the contract.
- Gift products were not found in other languages than English in
  the generate_gift_wizard.
Needs right to delete move_lines
Replace fiscal_date of Affectats in GP by date of invoice
State "Waiting Mandate" is working.

- Origin of contracts are editable
- Payment terms can be changed even if contract is active.
View improvements
Search views improved, menus reorganisation

- Search views improved for better finding
- Menus reorganization
- Added contracts origin menuitem

Conflicts:
	child_compassion/view/child_compassion_view.xml
	child_compassion/view/project_compassion_view.xml
	event_compassion/view/event_compassion_view.xml
Ability to depart unsponsored children.
small fix in view
Bug fix on invoice date computation for LSV/DD
Bug fixed on computation of GP Months paid on contract validation
Add again permissions for group_sponsorship
Update won_sponsorships in events on write description
PEP8 corrections
CRM Compassion improvement

- Update analytic account of project with manager_id
- Sync values from events and projects
Generate gift, find gift products bug fixed
Search view on children improved
Replace reference of contract by name, add analytic account to partner origins
Remove departed child from internet
Update version of modified modules.