Breer: The farce of free agency's tampering periodYou’ll hear a lot about free agency and the rules over the next three weeks. There will be breathless speculation over what will go down during the NFL’s so-called “tampering period,” a 48-hour stretch when teams and agents can legally negotiate for the first time. There’ll be clocks counting down to March 14 at 4 p.m.Just know this: Pretty much all of it is for show. The deals that will be done in 20 days? Those are real. But most of the other s