Changeset [cef7e4ddb515967f7fdb7d6dab9f61f49c1ee26d] by Jed Brown

Update test output for elasticity.

This is still using a St. Venant-Kirchoff constitutive relation which
goes haywire for moderate compression. One effect is that the resulting
linear systems lose positive definiteness. The case simulated here is
slightly beyond the physical regime and indeed, the system becomes
indefinite partway through the nonlinear solve.
https://github.com/jedbrown/dohp/commit/cef7e4ddb515967f7fdb7d6dab9...