[ANSI-Smalltalk] STEP dependencies and obsoletes

[Paolo Bonzini]

>     If you look at the top of an RFC you will see the title, authors and
>     what RFC(s) are made obsolete by the current RFC.
> 
>     I think it would be a Good Thing is our STEP documents carried such
>     information at the top too.

STEP 1 includes indeed, among the things in the "prolog" of a STEP:

* a list of prerequisite STEPs, upon whose contents discussion will be 
implicitly based;

* a list of STEPs that this proposal, if accepted, would supersede;

Paolo