Lua source code

[Asko Kauppi <askok@...>]

People have been asking for more comments in the source code.  I  
wouldn't necessarily agree, but there could be some things done to  
implicitly comment the behaviour.

- use of 'tmp' for obviously temporary value (i.e. 'tonumber' and  
'isnumber' use 'n' for such)
- use of '_bool' or 'int_bool' where 'int' is used as a boolean

Lua has a lot of the latter, and clearly seeing it's supposed to be a  
0/non-0 would be meaningful. When compiled in C++, it could simply be  
compiled as 'bool'.

-asko