patch for container.h

Hello, I found out that if the subs() method does a substitution on a lst the tinfo flag is not set properly. This then gives all kinds of weirdness in the canonical ordering. The solution is to set the tinfo correctly on two of the constructors in container.h . Also, it seems that if one of the expressions in a container is changed by a subs(), still subs_one_level() is called on that container. I think this is wrong. A patch is attached. Bye, Chris Dams