removed gridSize from the template arguments

- not needed and code much cleaner
some minor changes
new test-cases

main.cpp

@@ -15,7 +15,9 @@ int main(int argc, char** argv) {
 
 #ifdef WITH_TESTS
 	::testing::InitGoogleTest(&argc, argv);
+	//::testing::GTEST_FLAG(filter) = "*Importance*";
 	::testing::GTEST_FLAG(filter) = "*Walk*";
+
 	return RUN_ALL_TESTS();
 #endif