test_HDF5_searchers: Added a test for HDF5_searchers.get_matching_paths. This fixes #76.
test_HDF5_searchers: Added a test for HDF5_searchers.get_matching_paths_groups. This fixes #77.
test_HDF5_searchers: Added test for HDF5_searchers.get_matching_grouped_paths. This fixes #78.
test_HDF5_searchers: Added test for HDF5_searchers.get_matching_grouped_paths_found. This fixes #79.