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Add support for Sundials time integration in the MEUMAPPS-SS app

DeWitt, Stephen requested to merge ss_sundials into master

This is a significant update to the code, merging in a line of work that has been going on for a while.

Main change:

  • MEUMAPPS-SS now has an option to use Sundials for time integration

Other changes:

  • Some build system changes for robustly finding dependency libraries
  • New option for the equilibrium interfacial thickness instead of being hardcoded at 5*dx
  • New options for enforcing constraints on the evolution for phi (which mess up the Sundials integrator)
  • New diffuse interface initial conditions
  • New input options for controlling the elasticity solve tolerance and max number of iterations
  • New input option for controlling the verbosity level
Edited by DeWitt, Stephen

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