bug #4719 :  Fix some XSS flaws. The aim is to encode for HTML inputs coming from a user at rendering time

Conflicts:

	lib-core/src/main/java/com/silverpeas/util/EncodeHelper.java
	web-core/src/main/java/org/silverpeas/node/web/NodeEntity.java
bug #4719 :  Remove the filtering of javascript code in the WYSIWYG