Implicit Delayed Norton Creep Implemented

A custom implicit creep routine was developed. The routine was based upon Norton's creep equation using Hoop Stress with an additional delay to the onset of creep. The delay, called an incubation time, was an exponential function of temperature and stress. The original implementation used Sz for 2D elements (182) and Sy for 3D element (85,186,187) but was extended to use Seqv. The procedure for compiling will be explained as well as other features including a verbose flag, a hoop vs. equivalent stress switch, and the use of state variables to track element status.

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