Do not throw grenades in narrow places.

Removed displaying of "CROSSING" flag for nodes, as it's not used anymore.
Do not aim last / predict enemy in narrow places (like tunnels, when crouching).

source/engine.cpp

@@ -848,6 +848,9 @@ void Game::slowFrame () {
    // initialize light levels
    graph.initLightLevels ();
 
+   // initialize corridors
+   graph.initNarrowPlaces ();
+
    // detect csdm
    applyGameModes ();