message: Adds comments about some debug variables used by quest's InOutOctree
diff: #include <sstream>
  #include <unordered_map>
  -#define DEBUG_VERT_IDX -2 // 1160
  -#define DEBUG_TRI_IDX -2 // 187820
  -
  -#define DEBUG_BLOCK_2 BlockIndex::invalid_index()
  -// BlockIndex( {1346,1972,1691}, 12)
  -#define DEBUG_BLOCK_1 BlockIndex::invalid_index()
  -// BlockIndex( {336,493,423}, 10)
  -
  #ifndef DUMP_VTK_MESH
  // #define DUMP_VTK_MESH
  #endif
  #define QUEST_OCTREE_DEBUG_LOG_IF(_cond, _msg) ((void)0)
  #endif
  +// The following four variables are used in the QUEST_OCTREE_DEBUG_LOG_IF macro
  +// and are only active when DEBUG_OCTREE_ACTIVE is defined
  +#define DEBUG_VERT_IDX -2 // 1160
  +#define DEBUG_TRI_IDX -2 // 187820
  +
  +#define DEBUG_BLOCK_1 BlockIndex::invalid_index()
  +// BlockIndex( {1346,1972,1691}, 12)
  +#define DEBUG_BLOCK_2 BlockIndex::invalid_index()
  +// BlockIndex( {336,493,423}, 10)
  +
  namespace axom
  {
  namespace quest
  