* Rising cash basis, hefty exports lift corn * Soybeans range-bound on solid demand, big S.America crop * Soyoil surges 3 percent amid palm oil rally * Wheat supported by good exports, world supply worries (Rewrites throughout, adds quotes, updates prices, changes dateline from PARIS/SINGAPORE, changes byline) By Karl Plume CHICAGO, Nov 21 (Reuters) -[...]