MIKE SHE Hotfix 16-04-2012

This hotfix solves a problem in a MIKE SHE WM simulation with Two-Layer UZ and Irrigation + Snow Melt included. With this combination, the irrigation volume is added twice to the Overland component. An Overland water balance extraction shows a large water balance error corresponding to the irrigation volume. The error does not appear in a simulation without Snow Melt.