added a seed in EvtSimpleRandomEngine and cleaned up things

PspGen/EvtRandomEngine.cc

-//--------------------------------------------------------------------------
-//
-// Environment:
-//      This software is part of the EvtGen package developed jointly
-//      for the BaBar and CLEO collaborations.  If you use all or part
-//      of it, please give an appropriate acknowledgement.
-//
-// Copyright Information: See EvtGen/COPYRIGHT
-//      Copyright (C) 1998      Caltech, UCSB
-//
-// Module: EvtRandomEngine.cc
-//
-// Description: routines to generate random numbers
-//              really trivial random number 
-//              implementation.
-//
-// Modification history:
-//
-//    RYD      December 25, 1999           Module created
-//
-//------------------------------------------------------------------------
-//
-
-#include <stdio.h>
-#include <math.h>
-#include <iostream>
-#include "PspGen/EvtRandomEngine.hh"
-
-double EvtRandomEngine::random(){
-  
-  static unsigned long int next = 1;
-
-  next=next*1103515245+123345;
-  unsigned temp=(unsigned)(next/65536) % 32768;
-  
-  return ( temp + 1.0 ) / 32769.0;
-
-}
-
-
-