Modifying files for subdivision, recovery, and stabilization

Tests need to run nightly... more to come.
First checkin of new cohesive zone model for adaptive insertion

This model is taken from a paper by Ortiz & Pandolfi in IJNME (1999).
Refining Ortiz and Pandolfi cohesive zone model with test for normal separation

A little more verification to do regarding the test. Initial results are promising.
The test attempts to exercise the state variable and the specified stiffness governing interpenetration.