share project between organizations

[miromarchi]

We need to add the possibility for a project node to be a content of two or more og_groups, in order to be shared between more than one organization.

For example we could improve the collaborators pane.
At present the collaborators pane lists all the collaborators on the right panel of a project page, right below the "promoter" pane. Each collaborator card lists icon and title (linked to the collaborating organization).

We could add more objects to these cards, for instance:

• a link to the collaboration (using the double arrow icon as usual);
• a button to "add this collaborator to the promoters".

We still need the possibility to switch from the user's group to another group, which implies the possibility to change owner, not only to add one.

Maybe we can use entityform for this? Or maybe better rules_link

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