fixing bug #5885
IM sent messages are no more saved

Conflicts:
	lib-core/src/main/java/com/stratelia/silverpeas/notificationManager/NotificationSender.java

Conflicts:
	lib-core/src/main/java/com/stratelia/silverpeas/notificationManager/NotificationMetaData.java
	lib-core/src/main/java/com/stratelia/silverpeas/notificationManager/NotificationSender.java
fixing bug #5911
storing HttpSession instead of MainSessionController...

Conflicts:
	web-core/src/main/java/com/silverpeas/look/LookSilverpeasV5Helper.java

Conflicts:
	web-core/src/main/java/com/silverpeas/look/LookSilverpeasV5Helper.java
Some corrections :
- fixing bad behavior of user authentication verifiers when the user is anonymous
- fixing the security token renew process which was not performed at right time

Conflicts:
	lib-core/src/main/java/org/silverpeas/authentication/verifier/UserMustAcceptTermsOfServiceVerifier.java
fixing bug #5958 : from back-office, returning to last visited space or home page
on feature #5517, 'user zoom' must be activated when 'user cards' are
fixing bug #5784

Conflicts:
	web-core/src/main/java/org/silverpeas/publication/web/AbstractPublicationResource.java
Some corrections:
- fixing a wrong behavior around anonymous user and quick news
- fixing concurrent display on userZoom
- fixing concurrent display on identityCard
fixing unit test failures around look.

Conflicts:
	web-core/src/test/resources/spring-look.xml
Fixing merge conflict from 5.15.x