message: Workaround for Visual Studio buggy static member variable template
diff: @@ -13,7 +13,7 @@ namespace hmdf
  {
  template<typename T, typename V>
  -std::unordered_map<const HeteroVector *, V> HeteroVector::items_;
  +std::unordered_map<const HeteroVector *, V> HeteroVector::items_{};
  // ----------------------------------------------------------------------------
  