Recalculation of res_water_content
The residual water content is recalculated in Metamorphism.cc. This is at the end of a SNOWPACK time step. One may wonder if it is not a more accurate approach to recalculate it just before the bucket scheme is applied in WaterTransport, as PhaseChange may change the ice content, and thus the residual water content of an element. Anyway, one is at most 1 time step off so the expected difference is small. But it may be a clearer approach to put the function call just before the bucket scheme.