[Amforth] AmForth Weekend 4

[<ho...@tj...>]

Dear AmForthers,

I liked Erich's "AmForth Weekend" format, so I'm sticking with
it. This is AmForth Weekend 4. This weekend's motto is "Try not to
break anything".

The focus is on AVR8, amforth-shell.py and the website.

No release yet, but some activity in trunk.

Let me know what works, and what does not.

Best wishes,
Tristan

# SUMMARY

## AMFORTH-SHELL.PY

amforth-shell.py has had some syntax warning fixes and one new
feature. The syntax was correct at the time, but python has moved on.

A directive #stack has been added. This toggles on and off displaying
the contents of the mcu data stack as a prompt (if the word .s exists
on the device)

## AVR8

Within the existing codebase, some minor fixes to a handful of .asm
files that avra was rightly flagging with warnings about misalignment
in word name .db statements. Whilst avra padded these out correctly,
better to fix.

*Request for help* - I'm not a MS windows user, but I am keen that the
existing build system still works for MS windows. If you are a MS 
windows
user I would be grateful if you could try and build AmForth from trunk
and let me know if it still works for you.

## WEBSITE

This wasn't top of my initial list of things to look at. However,
without documentation, prebuilt hex files are of diminished
use. AmForth's documentation is a very special resource.  Time and
reST/Sphinx (the system that turns documentation source into html and
the website), however, have moved on. Running the documentation
through a modern Sphinx broke a few things on the site. These have
been fixed. Some missing svg files that were produced from dia format
files were salvaged from the 6.8 release. There remain some broken
links to missing pdfs/frt on the recognizer page. The documentation
source is available, but rebuilding requires a chain of personal
system upgrades I'm not quite ready for yet.

As an apprentice piece in writing something with reST, I've added a post
on the Opinion page.

## WHAT IS NEXT

Reference card
Prebuilt hex files for AVR8

## COMMITS

r2458 change of maintainer

r2459 minor fixes to amforth-shell.py syntax warnings fixed, modify #!
to a less fragile one

r2460 adds directive #stack to amforth-shell.py #stack toggles whether
the mcu data stack is displayed to left of input prompt > Default is
no.

r2461 fix .db padding warnings (from avra)

r2462 website update