Delete Tauola and Photos

This MR deletes the PHOTOS and TAUOLA Fortran-only generator interfaces. The PHOTOS and TAUOLA were replaced with Tauola++ and Photos++ Fortran/C++ generators a decade ago. Discussed with Ewelina.

Tagging @ewelina @fwinkl @jchapman

Generators/Photos_i/Photos_i/Ffpholun.h

-/*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
-*/
-
-
-
-#ifndef Ffpholun_h
-#define Ffpholun_h
-
-extern "C" {
-  void* ffpholun_address_(void);
-}
-
-/**
-@class    Ffpholun.h
-
-@brief      Class definition for ffpholun, which is used
-      to modify the Tauola FFPHOLUN common.
-
-@author         B. P. Kersevan
-
- Ffpholun Common access method
-*/
-
-class Ffpholun {
-public:
-  Ffpholun();
-  ~Ffpholun();
-  int& phlun();
-
-  inline void init(); // inlined for speed of access (small function)
-  // return common array lengths
- 
- private: 
-
-  struct PHOLUN;
-  friend struct PHOLUN;
-
-  struct PHOLUN {
-    int phlun;
-  };
-
-  static PHOLUN* s_ffpholun;
-};
-
-#include "Photos_i/Ffpholun.icc"
-
-#endif