BOULDER — Tibet’s Dalai Lama built his case for a happier, friendlier world in sold-out appearances Thursday at the University of Colorado, urging deeper self-study and compassion as remedies to rising tension — continuing a U.S. tour aimed partly at ensuring Tibetan survival. “Our goal should be, within the 21st century, a more compassionate humanity,” the Dalai Lama said at CU’s Coors Events Center. An 80-year-old monk in maroon-and-orange robes who is having trouble walking, he laughingly navigated language barriers and poor acoustics to share wisdom on wide-ranging topics: from girls using makeup (“External beauty really important, no question.