organizationController :  Using the factory to access OrganizationController
Defining also an interface
Simplifiying spring declaration
H2 : Mobing some tests to H2 thus removing the need for a postgresql server
Fix merge conflicts as well some tests issues. The execution context of the TestAccessAuthentified tests class is wrongly used/configured/cleaned up and impacts badly the tests in UsersAndGroupsTest class, this is why the tests in the TestAccessAuthentified class are yet all ignored (with the @Ignore annotation); they will be reactived once the tests will be cleaned up.