Performance

- Removed Context::timer_sync, as it makes no sense now that sync is not an
  automatic operation like gc.

src/Context.cpp

@@ -276,7 +276,6 @@ int Context::run ()
 
       << " init:"   << timer_init.total ()
       << " load:"   << timer_load.total ()
-      << " synch:"  << timer_sync.total ()
       << " gc:"     << timer_gc.total ()
       << " filter:" << timer_filter.total ()
       << " commit:" << timer_commit.total ()
@@ -284,7 +283,6 @@ int Context::run ()
       << " render:" << timer_render.total ()
       << " total:"  << (timer_init.total ()   +
                         timer_load.total ()   +
-                        timer_sync.total ()  +
                         timer_gc.total ()     +
                         timer_filter.total () +
                         timer_commit.total () +