Better handling of size limit when resizing a table

Avoid silent conversions from int to unsigned int when calling
'luaH_resize'; avoid silent conversions from lua_Integer to int in
'table.create'; MAXASIZE corrected for the new implementation of arrays;
'luaH_resize' checks explicitly whether new size respects MAXASIZE.
(Even constructors were bypassing that check.)

manual/manual.of

@@ -3234,7 +3234,7 @@ Values at other positions are not affected.
 
 }
 
-@APIEntry{void lua_createtable (lua_State *L, int nseq, int nrec);|
+@APIEntry{void lua_createtable (lua_State *L, unsigned nseq, unsigned nrec);|
 @apii{0,1,m}
 
 Creates a new empty table and pushes it onto the stack.