Fix memory leaks due to raw pointers created with 'new'.

[jeffmf]

1. Removed use of raw pointers and data allocated with new. These result in memory leaks if an exception is thrown or if not explicitly deleted by the pointer's recipient.
2. AdjancencyMatrix and BVH classes release their own resources. They are move constructable and move assignable, but not copy constructable or copy assignable.
3. MultiResolutionHierarchy is no longer responsible for deleting adjacency matrix data. Also its move and copy constructors and assignment operators are disabled.