- new members:  capacity(), two-argument resize()/setSize(), const storage()
- new static members: max_value(), packing(), etc.

  - added boundBox(const tmp<pointField>&) constructor for use with
    coordinate systems
  - moved some methods from treeBoundBox to boundBox and use VectorSpace ops

- boundBox::invertedBox is useful for initializing our own calculations
- NOTE treeBoundBox::greatBox is still in place, since it uses GREAT
  instead of VGREAT. If this is only historical, we can drop it.