v.surf.mass: Input should be vector "area" map? about grass-addons

[wenzeslaus]

Given lines like G_fatal_error(_("No areas in input vector <%s>"), in_opt->answer); and for (i = 1; i <= nareas; i++) {...if (Vect_get_area_cats(&In, i, Cats) I think "area" is correct. I would almost say that the default description should be sufficient, but this has also an optional input and the type of features expected in the input is actually something we should make more prominent.