The reaccumulation refactoring is moving forward. This commit is not so clean (lots of commented out debugging output, since this is a work in progress) but it "mostly works". The problem that is left is that the dwonsampling produces yearly sums a little bigger than they should (ie we are double-counting somewhere). But it compiles, it runs and it is "almost" correct. The simple upsampling works properly (ie producing 15 minutes values out of hourly data).