make :members() not return index, add -DBLLUA_ALLOWFFI, allow reading modules/lualib/, bug fixes

src/util/libts-lua.lua

@@ -89,11 +89,12 @@ local allowed_zip_dirs = tflip{
 local function io_open_absolute(fn, mode)
 	-- if file exists, use original mode
 	local res, err = _bllua_io_open(fn, mode)
-	if res then return res end
+	if res then return res
+	elseif err and not err:find('No such file or directory$') then return nil, err end
 	
 	-- otherwise, if TS sees file but Lua doesn't, it must be in a zip, so use TS reader
 	local dir = fn:match('^[^/]+')
-	if not allowed_zip_dirs[dir:lower()] then return nil, 'File is not in one of the allowed directories' end
+	if not allowed_zip_dirs[dir:lower()] then return nil, 'Zip is not in one of the allowed directories' end
 	local exist = _bllua_ts.call('isFile', fn) == '1'
 	if not exist then return nil, err end