THE SUCCESSFUL surgical separation of Olivia and Gianna Manuel does not stand alone; it is the latest, shining link in a golden chain of compassion that spans more than two decades of shared history between the Philippines and Saudi Arabia.  From the pioneering case of Ann and Mae Manzo in 2004, to the delicate separation of Akhizah and Ayeesha Yusoph, the marathon cranial procedure of Klea and Maurice Ann Misa, and now the miraculous victory...