I wish I could have been in on the creative meeting when the producers were discussing titles for this thing. Formerly called “Headshot," before someone presumably thought that title was too sissified, “Bullet to the Head” is about as apt a description for a film as I’ve seen in a while. But for all the empty violence, “B2TH” is still kind of fun and compared to last week's “Parker," its craftsmanship at its best. Sylvester Stallone plays Joe Bobo, a New Orleans