comparison audioDB.cpp @ 279:dee55886eca0 sampling

make the RNG a part of the audioDB object.

Easier to deal with memory discipline and initialization (though note
the FIXME comment in audioDB::initTables()).

Also initialize the RNG from the current time.  A mature implementation
would use a proper source of entropy...

   if(timesTable)
     munmap(timesTable, timesTableLength);
   if(l2normTable)
     munmap(l2normTable, l2normTableLength);
 
+  if(rng)
+    gsl_rng_free(rng);
+
   if(dbfid>0)
     close(dbfid);
   if(infid>0)
     close(infid);
   if(dbH)