Changes in the default annotation conversion process: by default no annotation are created in segments. Everything is done at mediaUnit level.
Enables to configure this conversion.
Add licences.


git-svn-id: svn://svn.forge.objectweb.org/svnroot/weblab/trunk/WebLabServices/WebServices/gate-extraction@496 a803c184-d8de-4a0e-a52b-d3eef88212b6