US Sec Mnuchin Places a Positive Spin on US/China Trade; Additional Wet Weather Central US into Early May Slows Corn Seeding

**AgResource Pre-Opening Sunday Calls: Soybeans 1 to 2 cents higher, corn steady to 1 cent higher with wheat called steady to 2 cents higher.  ** Weekend Weather & CBOT Market Discussion: Opening week CBOT calls are steady to slightly higher amid wet Central US weather and optimism on a US/China trade deal over the next…