The December WASDE made few changes to its outlook for the world grain supply and demand situation, which left the CBOT to essentially continue its existing trends. Wheat futures sold off 10-12 cents lower and soyoil joined the weakness and broke a major technical support zone. Soymeal continued rallying to new contract highs but that could not support the soybean market, which fell to 2-cent losses. Soybeans and corn traded both sides of unchanged as the WASDE offered little in the way of a fresh outlook.  The December WASDE featured only minor changes to the U.S. crop balance sheets, as is typical of the year-ending report but an outcome that was not expected this year. USDA trimmed the U.S. corn export forecast by just 75 Mbu and r...