Small fixes to docs, comments, and formatting.

Change-Id: I5fe0303ae3061d2c241b0f3129af1b77cda27d72
Add support for reading polyhedra.

This does not include support for side sets of polyhedra
as the underlying Exodus library function the reader uses
does not include support for polyhedra (plus, it would be
a significant effort).

Change-Id: If16054b98bd22e35599191ef53e9d6d174f3ff37
Test reading a polyhedral Exodus dataset.

Change-Id: I0afa93976faf09b742c35d3a987c5e7a0c58fc3a
Add test data with multiple polyhedra.

Change-Id: Iebbbbbcb1533c87c33b8bc2c30eb7f0e38288a04
Merge topic 'polyhedral-exodus-fixes' into master

e142138f Add test data with multiple polyhedra.
c7aa834f Test reading a polyhedral Exodus dataset.
52eb52d2 Add support for reading polyhedra.
0693db02 Small fixes to docs, comments, and formatting.