Pass amount of water removed from lakes by ROF component

As a future development beyond #132, we'll also need to pass the amount of water removed from lakes by the ROF component. Normally this will be the reverse of Precipitation minus Evaporation that's sent in (and hence can be ignored). But, when lakes are empty or nearly empty it will be less than that. This is required to balance water for the system. So likely will only matter when coupled to a ocean model. It's also possible that it's rare enough that it can be ignored most of the time.

See mizuRoute and CTSM issues:

https://github.com/NCAR/mizuRoute/issues/170

https://github.com/ESCOMP/CTSM/issues/1259