topocast 0.0.1

topocast 0.0.1

• First release.
• topocast() downscales a coarse raster onto fine terrain by moving-window
  regression. The relationship is a formula of layer names (prec ~ elev + slope); the response and coarse predictors live in one data raster and the
  fine predictors in onto. Coefficient grids are estimated with summed-area
  tables, so the cost is independent of the window radius.
• A time series is downscaled by passing a stack of coarse periods as anomaly:
  the baseline climatology is downscaled once and each period's anomaly is carried
  onto it, type = "ratio" or type = "additive".
• window_regression() exposes the terra-free matrix engine.