This is the simple Lua loadlib created by Eduardo Ochs
<http://angg.twu.net/>.  

Call as loadlib2("/absolute/path/to/library/foo.so", "lua_foolibopen")

lua_foolibopen will be called with the main Lua state as its argument.

On success, loadlib2 returns a true value; on failure, it returns nil
and a string describing the error.
