LNUM patch gets slight behavioural change

[Asko Kauppi <askok@...>]

Based on request, I've changed the LNUM patch behaviour to be more in- 
line with standard Lua.

<<
10-Oct-09 AK:  Made hex value handling same as with standard Lua with  
modes where this is
possible without sacrificing bitwise resolution (i.e. ldouble and  
double+int32 modes).

For double+int32 (new):
        0xffffffff = 2^32-1
        0xdeadbeef > 0

For i.e. float+int32 (like it was):
	0xffffffff = -1
        0xdeadbeef < 0

In other words, hex integers with topmost bit set are now stored  
(unsigned) as floating point
when doing so would not endanger losing their least significant bit  
accuracy.
<<

The changed patch is _not_ uploaded to LuaForge or anywhere. To get it  
you have to do a svn checkout:

	svn co svn://slugak.dyndns.org/public/2009/LNUM2

The LNUM patch, also known as "integer patch" allows Lua 5.1 to treat  
pure integer operations with full accuracy and more speed on non-FP  
platforms, without changing the external interfaces.

- asko