Hibernate4

Support of the last version 4.1 of Hibernate (yet 4.1.11).
Update of the version of some dependencies among aspectj (1.7.2), jersey (1.17.1), jackson (1.9.12), and spring (3.2.2). Currently, spring 3.2.x doesn't support the changes in Hibernate 4.2; these changes will be included with the version 4 of spring and perhaps backported into the future minor version 3.2.3 of spring. So, for instance we depend on the version 4.1 of Hibernate.

Don't forget to merge also the branch Hibernate4 of Silverpeas-Core, Silverpeas-Components, assembly-silverpeas, and Silverpeas-installer-package.