(New throughout; adds analyst comments, settlement prices) By Scott DiSavino NEW YORK, Oct 26 (Reuters) - The U.S. natural gas market slumped 10 percent to a fresh three-year low on Monday as traders acknowledged that this winter may be warmer than expected, curbing heating demand. Traders focused on unfavorable weather data for the psychologically important first week in November, when utilities usually shift to drawing down inventories to meet winter heating demand. "The la
