v.out.ascii: use standardized options (https://trac.osgeo.org/grass/ticket/2409)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@63116 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.out.ascii/args.c

@@ -66,7 +66,7 @@ void parse_args(int argc, char **argv,
     delim_opt->guisection = _("Points");
     
     dp_opt = G_define_option();
-    dp_opt->key = "dp";
+    dp_opt->key = "precision";
     dp_opt->type = TYPE_INTEGER;
     dp_opt->required = NO;
     dp_opt->options = "0-32";