 optional 'env' argument to load and loadfile (environment for loaded chunk)
<LI> <CODE>loadlib</CODE> may load libraries with global names (RTLD_GLOBAL)
<LI> new function <CODE>package.searchpath</CODE>
<LI> modules receive their paths when loaded
<LI> optional base in <CODE>math.log</CODE>
<LI> optional separator in <CODE>string.rep</CODE>
<LI> <CODE>file:write</CODE> returns <CODE>file</CODE>
<LI> closing a pipe returns exit status
<LI> <CODE>os.exit</CODE> may close state
<LI> new metamethods <CODE>__pa