* Separatist rebels said Nov. 29 they were ending ceasefire
* Plume of black smoke hangs over Kidal
* Some al Qaeda-linked fighters still in northern Mali
By Adama Diarra and Tiemoko Dialla
BAMAKO, Dec 14 (Reuters) - A car bomb killed two U.N. Senegalese peacekeepers and destroyed the only operating bank in the northern Malian town of Kidal on Saturday, one day before a second round of ...