Pluto alpha3

[Ben Sunshine-Hill <sneftel@...>]

Pluto has been updated to alpha3. This is quite a large update; Pluto
has been rewritten from 2-stage to 1-stage persistence. Feature
updates include:

* SP functions now create tables and userdata, instead of "filling" them
* Permanents can now be referenced by any type, including strings
* Restrictions on references by SP functions have been relaxed,
although more testing is needed
* Errors are now handled exclusively through lua_error

Thanks to Grisha, Virgil Smith, and others on the list for input.

Latest version available here:

http://lua-users.org/files/wiki_insecure/users/bsunshin/pluto-alpha3.tgz

Next version will most likely be a feature freeze and a beta; anyone
with feature requests, please email me or post on the list.

Ben