OO-377: map the reservations to the right roles, upgrade waiting list after a cancellation, better choice of templates, fix remove of reservations as coach/admin

OO-377: implements pending state or reservation for groups and repository entry access to participants

OO-302: add RESt API methods to manage the members of a repository entry, fix an issue with the calendar API, fix an unreliable unit test in UserTest by Oracle, add calendar API tests to the OpenOLAT suite

OO-291: optimize synching with instant messaging in the case of batch update, fix rights for the lin links statistics and course db in course...

OO-330: auto rank user from the waiting list to participants if the group allow this and someone increase the max number of participants or change other the settings of the group

OO-291:  enhance the main search function for groups, add search in waiting list, add search of public group, add unit tests

OO-291:  add documentation, add more unit tests for RightManager, merge tests of BusinessGroupService...

OO-291: first step: move business gourp manager to a business group service, remove dependency to the context...

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branch : bps