Added option for viscosity/strain rate strengthening/hardening, added option for sstemp calculation on restart

Fixed bug where boolean variables might not be set to their default values when not given in the input file, added option for fixed cloud

Added option for a pre-run isostatic compensation stage with a limit on the rate of compensation based on the geometry and a defined max velocity

Cleaned up/improved spinup steady-state thermal calculation option; Updated strain softening module to avoid name conflict; Added option to fix all surfaces in spinup phase; Added option to fix cloud during spinup phase; Added option for spinup convergence tolerance; Added option for using spinup phase material numbers

Added test to ensure the transum values for material transitions are less than or equal to the number of defined materials

Renamed minp as plastic_stress_min to be more accurate; Modified echoing of input values to follow order given in input file

Replaced ztrans functionality for material transitions below a given depth to a more general transition behavior which allows transitions in at any constant x, y or z value