It's been 30 years since photographer  Robert Mapplethorpe (1946-1989) and choreographer Alvin Ailey (1931-1989) died from AIDS.  The June-long celebration of civil rights and respect is also a reminder that while there are now ways of controlling the disease, there remains no cure. Two recent performances were timely reminders that both left indelible marks on art and society.   Triptych (Eyes of One on Another).  New York premiere. BAM Howard Gilman Opera House, June 6-8, 2019. In 1989 when the Corcoran Gallery in Washington, D.C. caved to pressure from politicians and the Religious Right and cancelled the travelling Robert Mapplethorpe: The Perfect Moment exhibit, protesters aimed a high-power scenic projector and