By ANNE MARXZE D. UMIL Bulatlat.com MANILA – Progressive women’s group Gabriela expressed outrage over the news that a 15-year-old girl was raped by three members of the Presidential Security Guard (PSG) inside the Malacañang Palace. Gabriela secretary-general Lana Linaban urged President Benigno S. Aquino III to call for an investigation. “No less than the…