test/test_settings_urls

   1 http://localhost:9763/search.pz2?session=1&command=init
   2 http://localhost:9763/search.pz2?session=1&command=settings&category%5Bz3950.indexdata.com%2Fmarc%5D=1
   3 http://localhost:9763/search.pz2?session=1&command=search&query=water
   4 2 http://localhost:9763/search.pz2?session=1&command=bytarget&settings=1