Add Lua 5.1 source files and documentation, including core libraries, interpreter, and test scripts.

ref/lua-5.1/test/printf.lua

@@ -0,0 +1,7 @@
+-- an implementation of printf
+
+function printf(...)
+ io.write(string.format(...))
+end
+
+printf("Hello %s from %s on %s\n",os.getenv"USER" or "there",_VERSION,os.date())