A witty guide to managing a real life wisely in a work-centered world.What do your colleagues, overlords, underlings, clients, and customers have in common? Not knowing how much they annoy you. Not to mention how much you may be annoying them. The route from cubicle to corner office is strewn with etiquette landmines. And now that the boundaries that once cleanly separated work from personal life are blurred, even polite people don’t recognize the difference between professional and social manners.    What do you say to a colleague who has just been fired?  How do you maintain a family-friendly office without discriminating against singles?  What’s the difference between showing romantic interest and sexual harassment?  Which colleagues should be invited to family weddings?  When should you be unavailable