include src/doc/foreword.tex in reference book?

[Qian Yun]

I think the foreword is very well written.

Shall we re-enable it in the reference book?

For historic accuracy, we should redefine
\Language{} to Axiom and reset it at the end.

- Qian

[Waldek Hebisch]

The text is somewhat dated, so I am not sure if we want to include
it in the reference book.

--
Waldek Hebisch