Revert previous change to clear chunk list on the end of each tick, make it configurable instead.

Whilst the new behaviour was technically correct as it prevented the possibility of the chunk tick list actually increasing over time, it introduced a few issues, namely the fact that it slowed growth to unreasonable levels, and interfered with the values which server admins have finally tuned, and come to enjoy over the last few years.
If it is absolutely essential that growth be halted and ticking reduced as much as possible, the config option is there for power users.
If we wish to 'fix' this by default in the future, a new chunk ticking algorithm, which actually has meaningful config options should be designed.

By: md_5 <git@md-5.net>

CraftBukkit-Patches/0069-Orebfuscator.patch

@@ -1,4 +1,4 @@
-From 97e7b007ed3107e3d442432648fdf234dc4264e8 Mon Sep 17 00:00:00 2001
+From 65f36750e5bee16a364326103d42a0cda40fac42 Mon Sep 17 00:00:00 2001
 From: md_5 <md_5@live.com.au>
 Date: Thu, 16 May 2013 18:51:05 +1000
 Subject: [PATCH] Orebfuscator
@@ -333,7 +333,7 @@ index 0000000..297fae8
 +    }
 +}
 diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
-index 447581d..743f9bd 100644
+index d4e8bf4..b9399ad 100644
 --- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
 +++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
 @@ -1,5 +1,6 @@
@@ -343,7 +343,7 @@ index 447581d..743f9bd 100644
  import java.util.List;
  import org.bukkit.Bukkit;
  import org.bukkit.configuration.file.YamlConfiguration;
-@@ -206,4 +207,36 @@ public class SpigotWorldConfig
+@@ -210,4 +211,36 @@ public class SpigotWorldConfig
          arrowDespawnRate = getInt( "arrow-despawn-rate", 1200  );
          log( "Arrow Despawn Rate: " + arrowDespawnRate );
      }