Nikkei jumps on weak yen, oil price slump; heads for big monthly gain

* Weak yen helps export shares * Oil price fall seen positive for exporters * ANA Holdings jumps to highest since Mar 2011 By Thomas Wilson TOKYO, Nov 28(Reuters) - Japanese stocks gained ground on Friday as a weaker yen helped exporter stocks, while falling oil prices were seen as likely to stimulate global demand, supporting investor sentiment. The Nikkei benchmark added 1.0 percent to 17,410.87 by 0125 GMT, and is on course for a monthly gain of around 6 percent. The Nikk