fixed short for TUPLE. Not finished; but at least the TUPLE parents list is correctly generated.
fix TUPLE short
fix short
allow to filter classes based on their names, i.e. before even attempting to load them
less class loading when not really needed
fix se short dictionary_key_traverser -- a corner-case bug in formal arguments specializing
LOGGING was used only for debug, it implied a lot of class loading for nothing
enhanced dictionary interface