added an optional checkbox to the file dialog, can be used for instance to optionally delete files after importing them, and is used for that, also rearranged the option menu items for the main activity a little

Update issue 39
Added a new string:
<string name="label_deleteAfterImport">Delete After Import</string>

src/org/thialfihar/android/apg/DecryptActivity.java

@@ -659,9 +659,8 @@ public class DecryptActivity extends BaseActivity {
                                         getString(R.string.specifyFileToDecryptTo),
                                         mOutputFilename,
                                         new FileDialog.OnClickListener() {
-
                                             @Override
-                                            public void onOkClick(String filename) {
+                                            public void onOkClick(String filename, boolean checked) {
                                                 removeDialog(Id.dialog.output_filename);
                                                 mOutputFilename = filename;
                                                 decryptStart();
@@ -674,6 +673,7 @@ public class DecryptActivity extends BaseActivity {
                                         },
                                         getString(R.string.filemanager_titleSave),
                                         getString(R.string.filemanager_btnSave),
+                                        null,
                                         Id.request.output_filename);
             }