Baltimore's Dr. Michael Zollicoffer, aka, Dr. Z, has been healing the members of his poverty stricken community for little or no cost for decades.   When he was diagnosed with colon cancer in October of last year, that same communtiy came to his rescue.   And after being featured on CBS' Sunday Morning, his message of love and humanity and a broken health care system is reaching millions.   He joined John Curley to share that message with us.