bug #4821 :  SilverpeasRole#isInRole method accepts now as parameters one or more role names
Bug #4794 and #4766 : fixing Silvercrawler download and upload problems
- adding HTTP 403 error handling
- adding two common Silverpeas Http Servlet (one to verify the user is authenticated)
- adding common treatment to check that the access of a file is not relative
- wiring the ComponentRequestRouter with the new Silverpeas Http Servlet
- improving index management around repositories