[ROD] Handover feature
Add a panel "handover" into the dashboard with the following possibilities
- Define a group of persons to communicate with (ex : NGI_UK) .This group is composed with users registered in the DB
- Define communication with this group (email could be sent), handover should be visible by the users in the group
- The group should be editable and modifiable by the creator . Anyone in the group could remove himself
- An entry should be created for each user of the group
- create test unit for group and handover
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