hdf5_msb

Merge pull request #2626 in HDFFV/hdf5 from tiny_shape_same_opt to develop

* commit 'de54cff50c419751e0080b6a732facac43f87ba6':
  Detect when there's the same-shaped selection of a single block of elements on both selections, but with different selection types (i.e. one selection defined as an 'all' type and the other as a hyperslab or point type), without falling into the generic selection iteration case.