We now have unique name representations per name

Before this, there could be multiple classes representing multiple id
columns. Now there is one class representing ALL the name "id". Very
important for analyzing potential name clashes.

tests/SelectTest.cpp

@@ -41,7 +41,6 @@ int main()
 	test::TabFoo f; 
 	test::TabBar t;
 
-	select(t.alpha).flags(sqlpp::all).from(t);
 	for (const auto& row : db(select(all_of(t)).from(t).where(true)))
 	{
 		int64_t a = row.alpha;