the contained sets are read locally (based on containing locally-represented
entities), the containing set is also selected for reading.  This comes up
with NEUMANN sets read from cub files, where those sets contain only the
surface geom_topo sets.  Fixes problem where Nek wasn't running with READ_PART
as the parallel read option.

A few other assorted changes:
- change to listing of set entities in Core::list_entities
- better option processing in iMeshP
- added a few more iMesh example codes

Passes checks in serial and parallel.



git-svn-id: https://svn.mcs.anl.gov/repos/ITAPS/MOAB/trunk@5280 6162379e-bd28-0410-9a7d-b7f4dcfcad3c