[IMP] Add Concurrence to Partner View
- Concurrence is set in "Paramètre MUCS">"Concurrence" window
- Concurrence is only a name field
- Parner is link to "Concurrence" as Many2one
- There are "concurrent sante" and "concurrent prévoyance"
- Concurrence sante has a effect date
- If there is a contract, concurrent_sante is set to none with compute method
- If partner is member_unmi ("prévoyance") concurrent_prevoyance_id is set to None
- Readonly fields when there are a contract ("sante" or "prevoyance")
- Add to search, with Date effect filter and group By on "Prevoyance" or "Sante" concurrent