'lineinfo' in prototypes saved as differences instead of absolute

values, so that the array can use bytes instead of ints, reducing
its size. (A new array 'abslineinfo' is used when line differences
do not fit in a byte.)

ltests.h

@@ -1,5 +1,5 @@
 /*
-** $Id: ltests.h,v 2.49 2015/09/22 14:18:24 roberto Exp roberto $
+** $Id: ltests.h,v 2.50 2016/07/19 17:13:00 roberto Exp roberto $
 ** Internal Header for Debugging of the Lua Implementation
 ** See Copyright Notice in lua.h
 */
@@ -111,6 +111,7 @@ LUA_API void *debug_realloc (void *ud, void *block,
 #define LUAL_BUFFERSIZE		23
 #define MINSTRTABSIZE		2
 #define MAXINDEXRK		1
+#define MAXIWTHABS		3
 
 
 /* make stack-overflow tests run faster */