make search-portlet compatible with new version of alert-portlet (OW2 v2.0)

Add save/load query features

JIRA task : 894

git-svn-id: svn://svn.forge.objectweb.org/svnroot/weblab/trunk/WebLabServices/Portlets/search-portlet@3283 a803c184-d8de-4a0e-a52b-d3eef88212b6