LEAD: Hollande pledges French support for Lebanon's stability Eds: Releads with Hollande remarks; epa photos

Beirut (dpa) - President Francois Hollande pledged France‘s support for stability and unity in Lebanon during a three-hour visit Sunday in the wake of the recent killing of domestic intelligence chief Wissam al-Hassan."France will confront with all its power anyone who seeks to destabilize Lebanon in order to guarantee its independence, security and unity," Hollande told a joint press conference