r.neighbors: add method=count

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54659 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.neighbors/main.c

@@ -53,6 +53,7 @@ static struct menu menu[] = {
     {c_range, NULL, NO_CATS, 1, 0, "range", "range value"},
     {c_stddev, w_stddev, NO_CATS, 0, 1, "stddev", "standard deviation"},
     {c_sum, w_sum, NO_CATS, 1, 0, "sum", "sum of values"},
+    {c_count, w_count, NO_CATS, 0, 0, "count", "count of non-NULL values"},
     {c_var, w_var, NO_CATS, 0, 1, "variance", "statistical variance"},
     {c_divr, NULL, divr_cats, 0, 0, "diversity",
      "number of different values"},