Mexican headline inflation likely ticked up in the first half of April as core inflation eased, a Reuters poll showed on Tuesday, boosting expectations that Mexico's central bank will hold its benchmark interest rate at its next monetary policy meeting. A median forecast of 11 analysts predicts annual headline inflation of 4.48% for the first 15 days of the month, above the 4.37% recorded in the second half of March. Mexico's headline inflation rate has sped up after bottoming out at 4.25% at the end of October and remains above the Bank of Mexico's target of 3%, plus or minus...