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/0011-View-Distance.patch

@@ -1,4 +1,4 @@
-From 4ddb7d7d8e92f0f4a333d80a3e3ced37b409bb4b Mon Sep 17 00:00:00 2001
+From 6a5b7f6ba565726739616f685d89593fa5862aa6 Mon Sep 17 00:00:00 2001
 From: md_5 <md_5@live.com.au>
 Date: Sat, 23 Mar 2013 09:52:41 +1100
 Subject: [PATCH] View Distance
@@ -19,7 +19,7 @@ index 4e0398c..ae4ca63 100644
          } else {
              this.f = i;
 diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
-index 812e887..9f09a3d 100644
+index 3a8856d..a0e4ade 100644
 --- a/src/main/java/net/minecraft/server/WorldServer.java
 +++ b/src/main/java/net/minecraft/server/WorldServer.java
 @@ -54,7 +54,7 @@ public class WorldServer extends World implements org.bukkit.BlockChangeDelegate
@@ -32,10 +32,10 @@ index 812e887..9f09a3d 100644
              this.entitiesById = new IntHashMap();
          }
 diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
-index 9f07e71..97d56bd 100644
+index 185442a..15b2ac8 100644
 --- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
 +++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
-@@ -120,4 +120,11 @@ public class SpigotWorldConfig
+@@ -124,4 +124,11 @@ public class SpigotWorldConfig
          expMerge = getDouble("merge-radius.exp", 3.0 );
          log( "Experience Merge Radius: " + expMerge );
      }