* #36914: New navigation working

This commit impacts the whole structure app, because we now have
nested Fragments. To keep retro-compatibility, we switched from normal
Fragment to Fragment from the support library.
diff --git a/src/org/sflphone/fragments/DropActionsChoice.java b/src/org/sflphone/fragments/DropActionsChoice.java
index 75d39ee..3ee617e 100644
--- a/src/org/sflphone/fragments/DropActionsChoice.java
+++ b/src/org/sflphone/fragments/DropActionsChoice.java
@@ -35,10 +35,10 @@
 
 import android.app.AlertDialog;
 import android.app.Dialog;
-import android.app.DialogFragment;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;