LIMA (Reuters) - Peruvian President Pedro Pablo Kuczynski pardoned former authoritarian leader Alberto Fujimori late on Sunday, clearing him of convictions for human rights crimes and graft before completion of a 25-year prison sentence. Kuczynski s office said in a statement that a medical review showed that Fujimori, 79, who governed Peru from 1990 to 2000, suffered from  a progressive, degenerative and incurable disease.   The pardon comes just days after a faction of Fujimori s supporters in the opposition-controlled Congress saved Kuczynski from a motion that would have forced him from office in the wake of a graft scandal. [nL1N1OL160] 