bugfixes : 
  * Handle RuntImeException in CutOut to set the job to FAILED when a RuntimeException happens (Must be improved in a future)
  * Setup Xstrem configuration in order to get a valid JSON for results:
{"results": {
  "result": [
    {
      "@id": "test.fits",
      "@type": "simple",
      "@xlink:href": "http://localhost:8182/sitools/uws/storage/372deb84-3dd2-4408-8d35-28e19e108bb8/test.fits"
    },
    {
      "@id": "test.jpeg",
      "@type": "simple",
      "@xlink:href": "http://localhost:8182/sitools/uws/storage/372deb84-3dd2-4408-8d35-28e19e108bb8/test.jpeg"
    }
}}
   * Set the public_host domain in UWS when a redirection happens to handle SITools behind a HTTP server.