THE OPEN May beans: 2 lower May meal:  2.90 lower May soyoil:  8 higher May corn:  1 3/4 lower May wheat:  5 1/2 higher The markets opened as expected with more weakness arising in the soy complex while wheat prices rallied sharply.  Traders were unwinding previous buy corn and bean/sell wheat trade, with the USDA outlook forum showing a slightly more constructive look to wheat plantings.    The Outlook Forum pegged 21/22 corn prices at $4.20, beans at $11.25, and wheat at $5.50.  Other statements were that the US may have to import beans to help ease tight domestic supplies, but further suggested import volumes would be limited on expected higher US soy acres.  In the meantime, the record...