move jpeg context freeing to a Deinitialise function instead of ~Image. Turn down the logging

src/zmc.cpp

@@ -358,6 +358,8 @@ int main( int argc, char *argv[] )
   delete [] next_delays;
   delete [] last_capture_times;
 
+  Image::Deinitialise();
+
   logTerm();
   zmDbClose();