Remove transactions from the dead pool when they become live, and from pending when they become dead. Addresses comments from Miron.

src/com/google/bitcoin/core/Wallet.java

@@ -842,6 +842,7 @@ public class Wallet implements Serializable {
                 TransactionOutput doubleSpent = input.getConnectedOutput(pool);
                 Transaction replacement = doubleSpent.getSpentBy().parentTransaction;
                 dead.put(tx.getHash(), tx);
+                pending.remove(tx.getHash());
                 // Inform the event listeners of the newly dead tx.
                 for (WalletEventListener listener : eventListeners) {
                     synchronized (listener) {
@@ -860,6 +861,7 @@ public class Wallet implements Serializable {
             // All inputs are either valid for spending or don't come from us. Miners are trying to reinclude it.
             log.info("   ->pending", tx.getHashAsString());
             pending.put(tx.getHash(), tx);
+            dead.remove(tx.getHash());
         }
     }