- Write interface for History and ConcreteHistory

- Write interface for HistoryObserver
- Remove obsolete interfaces


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@690 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/scheduler.cc

@@ -30,7 +30,6 @@
 #include <iostream>
 using namespace std;
 using namespace sgpem;
-using namespace memory;
 
 // Explicit template instantiation to allow to export symbols from the DSO.
 template class SG_DLLEXPORT Singleton<Scheduler>;