Renamed module to 'event_compassion', bug fixes and improvements.

- Upon event creation, create analytic account, analytic distribution
  and origin and link everything correctly
- [MERGE] module crm_child_sponsorship is merged into module event_compassion
- Ability to create event from opportunity (updated and fixed)
- Fixed regression bug where num_pol_ga field was removed from contracts_view
- [FIX] move lines and contracts are correctly linked to events
- [FIX] sponsorship origin name was not good for events
- [TODO] : add button create event in kanban view of Opportunities
- [TODO] : Fix acces rights to objects
- [TODO] : PEP8 fix