fixing bug #5437 by removing obsolete code

Conflicts:
	question-reply/question-reply-jar/src/main/java/com/silverpeas/questionReply/control/SilverpeasQuestionManager.java
	question-reply/question-reply-jar/src/main/java/com/silverpeas/questionReply/control/notification/QuestionNotifier.java
	question-reply/question-reply-jar/src/main/java/com/silverpeas/questionReply/control/notification/ReplyNotifier.java
fixing bug #5190 by using javascript promises (thanks YoCha)

Conflicts:
	question-reply/question-reply-war/src/main/webapp/questionReply/jsp/listQuestionsDHTML.jsp
fixing bug #6124 : using 'resizable' (interaction of jQuery UI) instead of 'splitter' plugin