fixing bug #4167
integration :  fixing bug #3958
integration :  removing obsolete JSP file : pdcPositions.jsp
integration :  fixing bug #3942
if targeted validation is used but no user have been defined to validate, validation is considered as classic one (and not collegiate).
Furthermore, if targeted validation is used, now users selection is mandatory to draft out publication.
Merge branch 'master' of github.com:Silverpeas/Silverpeas-Components
fixing bug #4138