. Improvements to portlet session handling in Login/Logout situations

- Storing of "inPortal" flag in a Threadlocal
 - No longer invalidate portlet session on logout - clear session by hand instead
   - Makes it easier to integrate with other JSR-168 vendors such as Liferay
. Added the current template NodeRef to the default templating model
   - Accessable as an object in the root of the templating model called "template"
. Added the current script NodeRef to the default scripting model
   - Accessable as a root scope object called "script"

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2934 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/app/servlet/AuthenticationHelper.java

@@ -107,6 +107,8 @@ public final class AuthenticationHelper
       }
       else
       {
+         // TODO: this prefix is not consistent between JSR-168 vendors!
+         //       we need a solution for each vendor?
          user = (User)session.getAttribute(AlfrescoFacesPortlet.MANAGED_BEAN_PREFIX + AUTHENTICATION_USER);
       }