bug #4716 :  Now, when a space manager or an administator is in the process of creating an application, both the existance and the visibility property of this application is checked. In the case the application to instanciate doesn't exist or isn't visible, an error page is then displayed to the user
bug #4707 :  Adding of two error pages: one for HTTP 500 and another for HTTP 401 errors. The silverpeasinfo.jsp renders only the version of the running Silverpeas when it is accessed by an unauthenticated user
bug #4707 :  Add the forgotten messages for the 401 and 500 errors
Bug #4707 : modifying some messages.
Feature #4844 - adding mechanism of terms of service acceptance :
- adding a common cache service that uses a useful cache mechanism (EhCache)
- adding the possibility of asking at different frequencies the acceptance of terms of service by the user