[Python-3000] Updated and simplified PEP 3141: A Type Hierarchyfor Numbers

[Bill Janssen]

Terry,

I liked these ideas so much I removed both "integer" and "float" from
the HTTP-NG type system.  See
http://www.parc.com/janssen/pubs/http-next-generation-architecture.html,
section 4.5.1.  Though if I was doing it again, I'd go further, and
make all fixed-point, floating-point, and string types abstract, so
that only application-defined concrete subtypes could be instantiated.

Bill