fixing bug #6070 : data on file server are deleted only in the case of a definitive deletion
fixing bug #6051 : do not refresh list of main groups when synchronizing one of them
fixing bug #5382 :
- removing some code which cannot be implicit in UserSearchCriteriaForDAO.java
- when setting group managers, limiting them to domain of group (except mixed domain)
fixing bug #6082 : do not set domainId by default