Master list: improvements

grid_ct

• return IDs: focal ID, grid ID (#16 (closed))
• warn that attributes are rep'ed (e.g.: density may be high for focal, but listed as high for all grid points, regardless of distance)

select_ct

• drop NAs in / at least definitely out
• what about sub = dem > 250? (#15 (closed))
• if x is result of make_grid -> eval_, should select_ do summary stats? (#17 (closed))
• auto import of units::as_unit for select_ct sub, etc ?

binary_layer

• faster? no double mask?

eval_*

• fix sharing of preprocessing between methods (!15 (merged))
• how to summarize categorical and ordinal?
• test attributes

eval_dist

• check types of x and layer