Adding in the ability for a side set to pass what cell it came from.

The side sets now can have information pointing back to their
originating global cell id and canonical cell side that they're
a part of. The original global cell id does not have to be loaded.

Change-Id: I00be2e0e7fd37ae97ba10c9ff0ce8f38992e349e
Merge topic 'exodusreader_side_set_info' into master

c5e22603 Adding in the ability for a side set to pass what cell it came from.