Compatibility module providing Lua-5.2-style APIs for Lua 5.1
This is a small module that aims to make it easier to write Lua code
in a Lua-5.2-style that runs on both Lua 5.1 and Lua 5.2. This does *not*
make Lua 5.1 entirely compatible with Lua 5.2, but it brings the API
closer to that of Lua 5.2.