Fix compilation with -Werror=format-security

sm/apps/test_json.c

@@ -5,7 +5,7 @@ int main() {
 	LDP ld = ld_alloc_new(50);
 	JO jo = ld_to_json(ld);
 	
-	printf(json_object_to_json_string(jo));
+	printf("%s", json_object_to_json_string(jo));
 	
 	return 0;
 }

sm/apps/test_json_ld.c

@@ -8,13 +8,13 @@ int main() {
 		if(!(ld = json_to_ld(jo))) {
 			fprintf(stderr, "Could not transform to laser_data:\n\n");
 			fprintf(stderr, "-----\n");
-			fprintf(stderr, json_object_to_json_string(jo));
+			fprintf(stderr, "%s", json_object_to_json_string(jo));
 			fprintf(stderr, "-----\n");
 			continue;
 		}
 		
 		jo = ld_to_json(ld);
-		printf(json_object_to_json_string(jo));
+		printf("%s", json_object_to_json_string(jo));
 		printf("\n");
 	}
 	

sm/lib/options/options.c

@@ -396,7 +396,7 @@ void options_dump(struct option * options, FILE*f, int write_desc) {
 }
 
 void options_print_help(struct option * options, FILE*f) {
-	fprintf(f, options_banner_string);
+	fprintf(f, "%s", options_banner_string);
 	fprintf(f, 
 	"Generic options: \n"
 	"  -help          Displays this help.\n"