[R6RS] Renaming write-...

[dyb at cs.indiana.edu]

> If we're renaming write-..., we should also consider renaming
> read-... to get a matching pair (or at least avoid having a
> non-matching one).  Choices:
>
> 1. display / read
> 2. put / get
> 3. output / input
> 4. out / in
> 5. push / pull

I'm in favor of #1.

> Please also consider the names of `read' and `write', relating to
> this.  (And the sound of pronouncing "xxx/xxx invariance.")  
>
> 1. read / write  (awkward with #1)
> 2. read-datum / write-datum (ditto)
> 3. <write-prefix>-datum / <read-prefix>-datum (for choices #2-#5)
> 4. <write-prefix> / <read-prefix>

Why don't we include these only in the "convenience" library, named
and with the same interfaces as in R5RS?

Kent