orig-5.0.3

This is a straightforward port of the Lua 5.0.3 front end (lexical
analyzer, parser, code generator, binary chunk dumper.)

The front end files are:

	lopcodes.lua	opcode definition
	lzio.lua	input streams
	llex.lua	lexical analyzer
	lparser.lua	parser
	lcode.lua	code generator
	ldump.lua	binary chunk dumper

Status: operational, passes all current tests (non-exhaustive)

Major test scripts are:

	test/test_llex.lua		exercises test cases
	test/test_lparser2.lua		exercises test cases

luac.lua is a clone of Lua 5.0.3's luac.lua, except that it generates a
binary chunk using Yueliang's front end implementation.

Note that performance is not a consideration. The code tries to stay
faithful to its C roots, so that if you were to do anything using this
codebase, backporting the changes to C will be easy. As such, this
codebase is meant for learning or prototyping purposes.

Many parameters are unused, because call arguments are retained as far
as possible. Changes and deletions are described wherever possible, but
documentation of changes is not comprehensive.

These files will stay faithful to the equivalent C files or modules in
Lua 5.0.3. For rewrites or new features, a new directory will be created
and a different set of files maintained. For Lua 5.1, a new directory
will be created.

The test directory has several primitive test scripts. Much better
testing is planned. Eventually, the codebase will be validated using
automated tests, so that any changes that breaks the system can be
caught easily.

The tools directory has a call graph generator, showing what gets
called. Specific modules and functions can be monitored, and some
parameters and return values are shown. This is a demonstration of the
flexibility and ease of manipulation of using a relatively inefficient
global table scheme.

For Lua 5.0.2, see Yueliang 0.1.3, which was the last release of Lua
5.0.2 material.