Merge pull request 'Only save/load files for the server' (#6) from Lonsfor/srb2k-leaderboard:lonsfor-patch-3 into master

Reviewed-on: #6

leaderboard.lua

@@ -272,6 +272,7 @@ local function stat_str(stat)
 end
 
 -- Read the leaderboard
+if isserver then
 	local f = io.open(FILENAME, "r")
 	if f then
 		for l in f:lines() do
@@ -327,6 +328,7 @@ if f then
 	else
 		print("Failed to open file: ", FILENAME)
 	end
+end
 
 function allowJoin(v)
 	if not cv_interrupt.value then
@@ -1315,6 +1317,7 @@ local function saveTime(player)
 		StatTrack = true
 	end
 
+	if isserver then
 		local f = assert(io.open(FILENAME, "w"))
 		if f == nil then
 			print("Failed to open file for writing: " + FILENAME)
@@ -1340,6 +1343,7 @@ local function saveTime(player)
 
 		f:close()
 	end
+end
 
 -- DEBUGGING
 --local function saveLeaderboard(player, ...)