EventCommonAlgs: const fixes.

DataVector has had a long-standing bug in which it was possible to get a
non-const pointer from a const_iterator.  This package was relying on this bug
to compile.  Fix this.


Former-commit-id: 2603e8b1

Event/EventCommonAlgs/src/I4MomDumper.cxx

@@ -195,7 +195,7 @@ I4MomDumper::dump( const std::string& collName )
   }
 
   // sorting the collection by Pt
-  typedef std::set<I4Momentum*, P4Sorters::Descending::Pt> Coll_t;
+  typedef std::set<const I4Momentum*, P4Sorters::Descending::Pt> Coll_t;
   Coll_t i4moms( coll->begin(), coll->end() );
 
   if ( m_display == Display::EEtaPhiM ) {

Event/EventCommonAlgs/src/INav4MomDumper.cxx

@@ -178,7 +178,7 @@ INav4MomDumper::dump( const std::string& collName )
   }
 
   // sorting the collection by Pt
-  typedef std::set<INavigable4Momentum*, P4Sorters::Descending::Pt> Coll_t;
+  typedef std::set<const INavigable4Momentum*, P4Sorters::Descending::Pt> Coll_t;
   Coll_t inav4moms( coll->begin(), coll->end() );
 
   FourMomUtils::dump( out, inav4moms );