Add back 'refresh' and 'settings' to folder context menu.

Both items are commonly used even by the average user (and likely both
are used more commonly than 'clear local messages'), so it makes
sense to provide them in the context menu as well as the action bar.

res/menu/folder_context.xml

@@ -1,9 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/refresh_folder"
+        android:title="@string/check_mail_action"
     />
     <item
         android:id="@+id/clear_local_folder"
         android:title="@string/clear_local_folder_action"
     />
-	
+    <item
+        android:id="@+id/folder_settings"
+        android:title="@string/folder_settings_action"
+    />
 </menu>

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

@@ -647,6 +647,12 @@ public class FolderList extends K9ListActivity implements OnNavigationListener {
         case R.id.clear_local_folder:
             onClearFolder(mAccount, folder.name);
             break;
+        case R.id.refresh_folder:
+            checkMail(folder);
+            break;
+        case R.id.folder_settings:
+            FolderSettings.actionSettings(this, mAccount, folder.name);
+            break;
         }
 
         return super.onContextItemSelected(item);