Integer accuracy patch (including wide constants)

[askok@...]

The Integer Accuracy patch is now revised to 5.1.1 
codebase, and is moving to "bugfix mode".

That is, I am myself pleased with the work and it passes 
my tests. The patch has changes (minimal) to the Lua VM, 
allowing full int64 constants to be given within the 
scripts, simply by 0x1234567812345678, or so.

We should probably gather a "working group" of people 
interested in this patch, and refine it to the point where 
production quality is at hand.

To fetch the patch:
   svn co svn://slugak.dyndns.org/public/lua-patches/

   int-all.txt
   int-all-511.patch

-asko