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addHeaderView on ListFragment = NullPointerException
@Override
public void onActivityCreated (Bundle savedInstanceState)
{
    Log.i(General.TAG, "beginning of onActivityCreated");
    super.onActivityCreated(savedInstanceState);
    if (mheaderView != null)  this.getListView().addHeaderView(getView().findViewById(R.layout.header)); // <= mheaderView is not null
    ListView lv = getListView(); // <= lv is not null

    lv.setAdapter(adapter);
    Log.i(General.TAG, "end of onActivityCreated");
}