switching kmelia :  Adding support for component configuration change notification
switching kmelia :
Removing specific notification classes that are not needed anymore
Adding some test
Merge branch 'switching_kmelia' of https://github.com/ehsavoie/Silverpeas-Core into switching_kmelia
move the interface CommentUserNotificationService in lib-core so an instances of this interface can be taken in charge by the CommentServiceFactory
Feature #4713 : adding tools to watermark or to stamp a PDF file with an image
Merge branch 'switching_kmelia'
Merge branch 'SilverYoCha-feature-4713'
Set the stable and development version of the installer for the web site
Merge branch 'master' of github.com:Silverpeas/Silverpeas-Core
closing feature #3765 suppression des taches
closing feature #3765 suppression des taches
closing feature #3765 suppression des taches - correction bug de réouverture de tache dans l'historique
closing feature #3765 suppression des taches
closing feature #3765 suppression des taches, properties review