fix up some Java warnings.

src/forge/CardList.java

@@ -6,7 +6,6 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.Iterator;
-import java.util.Random;
 
 import forge.card.cardFactory.CardFactoryUtil;
 

src/forge/ComputerUtil.java

@@ -6,8 +6,6 @@ import java.util.Arrays;
 import java.util.Comparator;
 import java.util.HashMap;
 
-import javax.swing.text.html.MinimalHTMLWriter;
-
 import forge.card.abilityFactory.AbilityFactory;
 import forge.card.cardFactory.CardFactoryUtil;
 import forge.card.mana.ManaCost;

src/forge/GameAction.java

@@ -237,7 +237,9 @@ public class GameAction {
 					};
 
                     Command notPaid = new Command() {
-                        public void execute()
+						private static final long serialVersionUID = 5812397026869965462L;
+
+						public void execute()
                         {
                             AllZone.GameAction.exile(recoverable);
                         }

src/forge/card/spellability/Ability_Activated.java

@@ -6,7 +6,6 @@ import forge.AllZoneUtil;
 import forge.Card;
 import forge.CardList;
 import forge.CardListFilter;
-import forge.Constant;
 
 
 abstract public class Ability_Activated extends SpellAbility implements java.io.Serializable {

src/forge/card/spellability/Ability_Mana.java

@@ -7,7 +7,6 @@ import forge.AllZone;
 import forge.AllZoneUtil;
 import forge.Card;
 import forge.CardList;
-import forge.Phase;
 import forge.card.cardFactory.CardFactoryUtil;
 import forge.gui.GuiUtils;
 

src/forge/card/spellability/Cost_Payment.java

@@ -5,13 +5,10 @@ import javax.swing.JOptionPane;
 import forge.*;
 import forge.card.abilityFactory.AbilityFactory;
 import forge.card.mana.ManaCost;
-import forge.card.mana.Mana_PartPhyrexian;
 import forge.gui.GuiUtils;
 import forge.gui.input.Input;
 import forge.gui.input.Input_PayManaCostUtil;
 
-import java.util.ArrayList;
-
 public class Cost_Payment {
 	private Cost cost = null;
 	private SpellAbility ability = null;