Fixed some compilation problems.

Fixed some compilation problems.
Switch to using TParameter<T> (from TNamed) for storing parameters of the
analysis, as these can be merged.   Previoulsy, we used TNamed objects,
but since these cannot be merged, the stupid file merger writes copies
of every single object to the merged file and thereby slowing down
everything.  It would be good if the merger could be fixed - perhaps by
allowing a plug-in for merging a specific class of objects - e.g.,

  class TObjectMerger
  {
  public:
    virtual TObject* Merge(TObject* existing, TList* list);
    virtual TObject* Merge(TObject* existing, TObject* next);
  };
  TObject*
  TObjectMerger::Merge(TObject* existing, TList* list)
  {
    TMergeInfo info(existing);
    TClass* cl = existing->Class();
    ROOT::MergeFunc_t f = cl->GetMerge();
    if (f)
      f(existing, list, &info);
    return existing;
  }

  TNamedMerger : public TObjectMerger
  {
    TObject* Merge(TObject* e, TList* l)
    {
      TString tit(e->GetTitle());
      TIter next(l);
      TObject* o = 0;
      while ((o = next())) {
       tit.Append(" ");
       tit.Append(o->GetTitle());
      }
      return e;
    }
  }

Some fixes to the train setup to show default values of the options.