Bring back Barnicle. That's what The Boston Globe should do: It should rehire Mike Barnicle. It should get off its high moral horse, forgive and forget, and bring back the controversial columnist. It would put some life back into the troubled newspaper. The fact of the matter is, the paper hasn't had a popular, highly readable, entertaining general-assignment columnist since Barnicle was drummed out of the Globe City Room on plagiarism charges. While many Globies have tried to be the new Barnicle, nobody has succeeded.