message: Add comments to accumulatormap.cpp.
diff: using namespace libzerocoin;
  using namespace std;
  +//Construct accumulators for all denominations
  AccumulatorMap::AccumulatorMap()
  {
  - //construct accumulators for all denominations
  for (auto& denom : zerocoinDenomList) {
  unique_ptr<Accumulator> uptr(new Accumulator(Params().Zerocoin_Params(), denom));
  mapAccumulators.insert(make_pair(denom, std::move(uptr)));
  }
  }
  +//Reset each accumulator to its default state
  void AccumulatorMap::Reset()
  {
  mapAccumulators.clear();
  @@ -29,6 +30,7 @@ void AccumulatorMap::Reset()
  }
  }
  +//Load a checkpoint containing 8 32bit checksums of accumulator values.
  bool AccumulatorMap::Load(uint256 nCheckpoint)
  {
  for (auto& denom : zerocoinDenomList) {
  @@ -45,6 +47,7 @@ bool AccumulatorMap::Load(uint256 nCheckpoint)
  return true;
  }
  +//Add a zerocoin to the accumulator of its denomination.
  bool AccumulatorMap::Accumulate(PublicCoin pubCoin, bool fSkipValidation)
  {
  CoinDenomination denom = pubCoin.getDenomination();
  @@ -58,6 +61,7 @@ bool AccumulatorMap::Accumulate(PublicCoin pubCoin, bool fSkipValidation)
  return true;
  }
  +//Get the value of a specific accumulator
  CBigNum AccumulatorMap::GetValue(CoinDenomination denom)
  {
  if (denom == CoinDenomination::ZQ_ERROR)
  @@ -65,6 +69,7 @@ CBigNum AccumulatorMap::GetValue(CoinDenomination denom)
  return mapAccumulators.at(denom)->getValue();
  }
  +//Calculate a 32bit checksum of each accumulator value. Concatenate checksums into uint256
  uint256 AccumulatorMap::GetCheckpoint()
  {
  uint256 nCheckpoint;
  