Syria and Qatar to pay back Syria's debt to the World Bank / Lebanon's prime minister visits Syrian president to discuss border demarcation and security / Lebanese PM visits Syria's president to reset years of strained relations / Fighting erupts along Lebanon-Syria border after 3 Syrian soldiers killed / Lebanon's PM meets Syria's de facto leader in Damascus / Syria's foreign minister visits Qatar as new authorities seek regional and global diplomatic ties / Lebanese PM, Syria's new leader discuss situation on shared border / Prominent Lebanese figure meets Syrian insurgent who led Assad's ouster, seeking better relations