This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
so many). For now, the only extended attribute implemented is NO ECHO,
useful for things like passwords. See TESTS/input2.c for an example.
This should go into 2.2.
