Added option LUA_NOBUILTIN

This option allows external code to avoid the use of gcc builtin macro
'__builtin_expect' in the Lua API.

Optimization for 'n^2'

Squares are much more common than other exponentiations, and 'n*n' is
much more efficient than 'pow'.

Merge branch 'master' of https://github.com/lua/lua

Adding file README.md to local repository.

Fixed bug of long strings in binary chunks

When "undumping" a long string, the function 'LoadVector' can call the
reader function, which can run the garbage collector, which can collect
the string being read. So, the string must be anchored during the call
to 'LoadVector'. (This commit also fixes the identation in 'l_alloc'.)

Details

Added as incompatibility, in the manual, the extra return of 'io.lines'.

Version 5.4 beta

Alpha release for Lua 5.4

Lua version 5.3.5

Version 5.4-w2, first version for development using GIT.

From this version on, this GIT is the official repository of Lua. Previous
versions are translations from the RCS used previously, and may not be
accurate.

small updates