Fixed solution so that it matches mesh.

Needed to get the sides of the fault correct in displacement field.
Added one and two fault hex8 full scale tests.

Updated README files for tri3, tet4, and hex8 full-scale tests.
Merge branch 'baagaard/fix-fullscale-3d-tests'

* baagaard/fix-fullscale-3d-tests:
  Added one and two fault hex8 full scale tests.
  Fixed solution so that it matches mesh.