Everyone's favorite thug angel, Tupac Amaru Shakur, would have been 38 today. Born in 1971 to a Black Panther mother, 'Pac came to symbolize the voice of his generation like no one except maybe Jim Morrison, another societal rebel who became a pop culture phenomenon. (Interestingly, neither 'Pac nor Mr. Mojo Rising rate a mention in Peter Hautlaub's "resurrect-a-dead-celebrity-for-one-concert" article in today's Chron. Blame it on the a-a-a-a-alcohol - or the copy editing.) In honor of '