HERZLIYA, Israel — After seven weeks held hostage in the tunnels of Gaza, they are finally free to laugh and chat and play.... In practice, some have had to be convinced there’s no longer a need to save a cherished bit of food in case there is none later. Advertisement At last, the 86 Israelis released during a short-lived truce between their government and Hamas are home.... Some of their parents are dead and others are still held hostage, foreshadowing the difficulty of days ahead. And so, s