Fixed some more warnings:

- Removed unused imports
- Removed unnecessary @SuppressWarnings("deprecation") annotations
- Added @SuppressWarnings("deprecation") to API 1-3 code that's now (API 5) deprecated
- Added missing @Override annotation

src/com/fsck/k9/EmailAddressAdapter.java

@@ -38,7 +38,6 @@ public abstract class EmailAddressAdapter extends ResourceCursorAdapter
              * Check the version of the SDK we are running on. Choose an
              * implementation class designed for that version of the SDK.
              */
-            @SuppressWarnings("deprecation")
             int sdkVersion = Integer.parseInt(Build.VERSION.SDK);       // Cupcake style
             if (sdkVersion < Build.VERSION_CODES.ECLAIR)
             {

src/com/fsck/k9/EmailAddressAdapterSdk3_4.java

@@ -27,6 +27,7 @@ import com.fsck.k9.mail.Address;
 
 import static android.provider.Contacts.ContactMethods.CONTENT_EMAIL_URI;
 
+@SuppressWarnings("deprecation")
 public class EmailAddressAdapterSdk3_4 extends EmailAddressAdapter
 {
     public static final int NAME_INDEX = 1;

src/com/fsck/k9/activity/ColorPickerDialog.java

@@ -17,7 +17,6 @@
 package com.fsck.k9.activity;
 
 import com.fsck.k9.R;
-import com.fsck.k9.R.string;
 import android.os.Bundle;
 import android.app.Dialog;
 

src/com/fsck/k9/activity/FolderList.java

@@ -9,7 +9,6 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.PowerManager;
-import android.os.PowerManager.WakeLock;
 import android.util.Config;
 import android.util.Log;
 import android.util.TypedValue;

src/com/fsck/k9/activity/setup/SpinnerHelper.java

@@ -73,6 +73,7 @@ public class SpinnerHelper
             this.entry = entry;
             this.value = value;
         }
+        @Override
         public String toString()
         {
             return entry;

src/com/fsck/k9/helper/AutoSyncHelper.java

@@ -46,7 +46,6 @@ public class AutoSyncHelper
          * Check the version of the SDK we are running on. Choose an
          * implementation class designed for that version of the SDK.
          */
-        @SuppressWarnings("deprecation")
         int sdkVersion = Integer.parseInt(Build.VERSION.SDK);
 
         String className = null;