Upgrade org.dawb.hdf5 to Java 7 runtime environment
New functionality in HierarchicalData classes

Extract Scalar to get a scalar value from a Dataset
Compare Scalar to compare two arbitrary Objects
Get Attribute Values to get all attributes for a
  given node
Make IHierarchicalDataFile AutoCloseable

Includes tests for new functionality
HDF5/Nexus Workspace and File model

A caching model that is used by Eclipse to accelerate sorting
and filtering of large groups of Nexus (and HDF5) files.

Includes tests that use Mockito, which temporarily means that
this plug-in depends on Mockito/Hamcrest/Objenesis. At some
future point the pre-existing and new tests can be split into
a fragment.
Merge branch 'nexus_navigator_sorters_and_filters'