snapshot of Lua 4.1 (work)

[Luiz Henrique de Figueiredo <lhf@...>]

A new snapshot of Lua 4.1 (work) is now available at
	http://www.tecgraf.puc-rio.br/lua/work/
An updated manual is also available at the same location.

The main change in this version is that Lua now has lexical scoping; upvalues
are gone!

Other changes include C upvalues via pseudo-indices (as suggested by ET),
access to the registry and the table of globals also via pseudo-indices,
better implementation for the "array" part of tables, new "concat" function,
references moved to lauxlib, and more.

Of course, none of these changes are definitive. This is simply a work version
that is being made available so that you can experiment with it, specially to
get a feel of the new lexical scoping.

Enjoy.
--lhf