THM: freezing related updates

Dmitri Naumovrequested to merge
endJunction/ogs:THM-FreezingUpdates into master

See individual commits for changes.

  • refactor(THM): consistent Jacobian signs
  • test(THM): avoid ice formation at low positive temperatures
  • feat(THM) Add epsilon_0 output
  • feat(THM): ice volume fraction avg output
  • feat(THM): compute ice vol. fraction in initialization
Edited by Dmitri Naumov

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