BUG(TST): unable to save/load namedtuples
Merge remote-tracking branch 'gh-yarik/bug/namedtuples_hdf5'

* gh-yarik/bug/namedtuples_hdf5:
  BUG(TST): unable to save/load namedtuples
BF: Fix half of a fix for gh-225

Synopsis: it is fucked-up!
BF: HDF5 store: search for type instances if name mismatch (Close gh-225)