fixing bug #3958
removing obsolete JSP file : pdcPositions.jsp
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.
integration :  Merge branch 'kmelia-validation-bugfixes' of https://github.com/NicolasEYSSERIC/Silverpeas-Components into integration
components #5.11.x :  Merge branch 'components-5.11.x' of github.com:Silverpeas/Silverpeas-Components into components-5.11.x