Move dpTableEntryComp from hpp to cpp
Modify the Makefile
Modify the minEnergyScheduleFixed function

  Now it takes
  const vector<TaskVoltageTable>&
  as another argument. It will find
  the task info from that table.
Calling minEnergyScheduleFixed in Scheduler using new way

  Because we need task voltage table in
  minEnergyScheduleFixed.
Added VoltageTable and TaskVoltageTable classes

  To manage the voltage and task behaviour under
  different voltages.